DD is 11 and loses everything - constantly.
Since she started school we have probably lost 4 items of clothing per half term, she just discards things, it doesn't occur to her to pick them up or put them somewhere sensible. When she looks for them, she gets distracted and just wanders around then eventually tells me they were stolen.
This week she left half her uniform behind after karate club and a new pair of good trousers have vanished. I had a bit of a rant and told her I'm taking the cost out of her pocket money to try and teach her some care and the value of things. She is now in floods of tears.
Unfortunately, I can't even go in to help her look as she is picked up by after school club then taken to another school. Her school is closed by the time I pick her up and not open when I leave for work.
I think I'm doing the right thing but feel hellishly guilty.