Ex partner (many, many years ago!) was asked by his neighbour / landlord / friend (NLF) to keep a suitcase for him just for a few days (and I think there was a comment about the police may be coming round). I said I thought it was really off and that ex should definitely find out what's in it, before agreeing to hold onto it (running through everything from potentially perverting the course of justice to being complicit in something nefarious... As a side note, it was ex's dream to be a police officer 🙄). Ex said he trusted NLF with his life, it wouldn't be anything bad and he wouldn't be so disrespectful as to ask - there was no question about it, he was looking after the suitcase.
Anywaaay... Fast forward a few years and NLF is sentenced to 25 years in prison for SA boys.
Fast forward a couple more years and ex also receives a custodial sentence for having a relationship with an underage girl.
I didn't learn any of this until some years later and, as soon as I was made aware, I got in touch with the police and told them everything I knew. I never found out what was in the suitcase and I think I'm probably better off for it.
Unsurprisingly, I'd have questions about keeping someone else's suitcase, without knowing the reason why. A woman attempting to escape an abusive relationship, for example, should definitely be helped but I'd need a discreet nod to that before I'd agree.