Would I be unreasonable to email the gym manager after my shampoo and conditioner were stolen from locked locker?

No it not. That does not excuse someone from stealing her things, it should still be reported.

1.She has said she is sure.
2.Mind your own business.

I would e mail the manager, there may well be a spate of petty thefts going on. If you are not allowed to use the lockers overnight and someone opened it to check it would have expected the whole bag to have been removed and stored in lost property. You could have collected it the next day. What I wouldn’t expect is someone to open the locker and help themselves to your belongings.
There must be a staff rota so they know who was in work at the appropriate times.
A member of the public would have had to force the lock on the off chance of finding something worth stealing.

But you can’t be sure that they were taken from the locker. You may well have left them out and how can you afford the gym but not a bottle of shampoo?

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this

Don’t say you take full responsibility @DickieAnderson

You took reasonable steps to secure your belongings. It’s not unreasonable therefore to expect that they would be safe.

Someone has stolen from you. The gym manager needs fo investigate.

The owner of the car park in this scenario can't take any responsibility for randoms breaking in to the car but if the car park was locked at night and only members of staff had access and a member of staff broke into the car that's a different situation!

No, this would apply if she'd left them in the open area of the gym but not in a locked locker. The establishment doesn't take responsibility for items left where anyone can access them but it's a completely different proposition if staff members are opening lockers with the master keys and stealing things! The disclaimer certainly does not apply here. It would be completely inadequate of them to shrug and say 'not our problem' if she reports this. Theft is a serious problem and they must take it seriously regardless of whether OP should have left her things in a locker overnight or not.

Don’t be so passive!! You have the right to be upset. And the right not to have your stuff stolen. Speak up! Complain! Ask for recompense. You’re a long term valued client. Be assertive!

ah - thanks, didnt spot that

You're lucky you had anything at all left in the locker -- you really can't leave anything in the gym lockers when you're not physically present at the gym, otherwise everyone would just bagsie a personal locker for life!

Practically, it's no different to just abandoning your things in any other public building. Was it really so difficult to take a gym bag 15 minutes down the road?

Most gyms would have just emptied it at the end of the day.

It's right there in the OP:

My friend had an emergency and needed me to go and watch her kids, I’d walked to the gym as it’s 3 minutes from home so was on foot to her house 15 minutes away. I didn’t want to drag all my gym stuff so left it in the locker and took the key and planned to go back the next morning to collect my things.

Going forward, why not invest in a swimming cap to stop your hair getting wet and needing so much expensive shampoo? 🤷‍♀️

This. A swimming cap won’t keep your hair completely dry, but will keep most of the water out. I spend a lot of money getting my hair salon coloured so obviously I want it to last as long as possible. Used to use expensive shampoo/conditioner too but then it got discontinued and I’ve found a cheaper alternative which is just as good if not better, so I’d been wasting my money all along.

I would inform the hotel, they need to know an expensive item has gone missing. It might prompt them to invest in wristband operated door locks like they have at my health club.

It's odd that someone would rifle through your bag and only swipe the (unopened?) shampoo and conditioner bottles. Surely someone working at the gym wouldn't risk their job for toiletries, no matter how high end? Isn't it more likely a fellow gym user has opened your locker and helped themselves? At the gym I go to, several lockers have the same key, which only came to light when someone lost theirs, and was able to access their locker using my key.

I used to just go swimming and then go home and shower. I don't imagine your hair will suffer for a short time between swimming and going home anyway.

Why did you take them to the gym and not use them?

You can ask at reception what might have happened if you're very sure they were in there.

I hope you did report it. There probably won't be a direct outcome (as there is likely a "use of lockers is at own risk" policy) but it will hopefully alert management to what is going on. If it's a staff member they have likely done it before and will do it again. Hopefully they'll get caught.

This happened to me once though it was over 20 years ago. My bag had been taken out of a locked locker, emptied out (there wasn't anything worth stealing) and stuffed back in, the locker was then left unlocked. I found some of my stuff in the corner on the floor. Most likely the perpetrator was interrupted by someone coming in. I told the manager and he was totally unbothered and even sniggered a bit about how my stuff must be a bit crap if a thief didn't actually want to take anything. I didn't renew my membership after that.

Even if you were not allowed to leave things in the locker overnight, I'd expect staff to remove the items and put them to one side, but honestly I'm wondering whether you left them out since you were in a rush to leave.

Someone going into your bag in your locker must’ve had a master key. Expensive products are easy to target either for resale or use by themselves/others. Would be interesting to know what they say.

The manager absolutely know a member of staff /guest is a thief...

If you can have a conversation with the manager, I suggest that would be the best thing to do. If one of the team is a thief, they could be stealing more than just shampoo.

Email the Manager asking for a copy of their policy on locker use then explain why you're wanting it. Let them know your stuff was left over night which you take responsibility for, however you still don't think that gives anyone reason to steal from you. Ask them to check CCTV as you'd like them to be aware if their staff is responsible for taking your Shampoo & Conditioner.

I'd mention it. If there is a thief on the staff team, I'm sure management will want to know. They may not be able to do anything, but there may be other reports and your report could help in building evidence.

Did the manager reply?