That is really phuq'd up!
I know the feeling, 'cept all I had left WAS CD's after they violated my car in Feb.
Get yourself an alarm with a pager/paging remote . . . that way you can know when somethin' goin' on. That's the best thing you can hope for nowadays.
If you have apartment renter's insurance, you can get reimbursed for your lost items . . .