WHen I was in college, the general rule was if you left your laundry in the dryer for more than an hour or so after the cycle was done, you'd come back to find it not in the dryer.
If you were lucky, it would be piled on top of the dryer
If you were less lucky, it would be thrown on the floor
If you were even less lucky, it would have been thrown on the floor and walked all over
If you were so silly as to have left it there for days, you might see your favorite T-shirt being worn by someone else, or found it weeks later in an off-campus thrift shop.
It's very possible that the landlord did not throw out your clothes. After a week, other people may well have figured out the clothes were fair game and taken them, leaving nothing but underwear and ratty stuff behind, which the landlord then assumed had been left as trash.
I ditto this. Really, a week, in a shared laundry?
Although, it would've been nicer of him to take the leftovers to Goodwill or something... you know, so they don't end up in a landfill.