/Blu rays etc
How can you not have space to pile blu-rays in the room?! Why would you choose to leave your blu-rays with somebody you'd never met over just putting up with tripping over them in your own room?
This just gets more weird
The whole thing is a mess and I don't know how you are going to sort it out - you've no relationship with the guy who lives there, there is no physically proof any of the stuff is yours or that it was ever even there.
I can't imagine this is going to end with anything other than you putting it down to experience and buying some new blu-rays.