1, Take pictures
2, Written description, to include make, model, serial number
3, Burn to a CD
4, KEEP THE CD SOMEWHERE ELSE. Your desk at work. Your Dad's Sock Drawer. Do a CD for your best friend, you keep his, he keeps yours.
Frankly, with the time lapse- yer screwed. My advice- not that you asked for it- For a relatively small $$ amount, you learned a valuable lesson. Now, keep that information to your self. Making an accusation without proof (and you have not told us anything that begins to approach the definition of proof) is not going to do a thing but start a fight. Let it go, and remember to keep crazy people at a distance.
Lesson I learned from my dad- if there is something you really want to keep, put it in your pocket, or put a lock on it.
Items 1-4 above are not just for some jerk swiping a gun- but when your house catches fire- or like me, a tornado tears up your house, and you want to file a claim with your homeowner's insurance, you are going to need proof that you DID have them.
PS- you have plenty room on the CD. As long as you are making it, take camera, shoot 2 pics of each room, add them to CD. Great quick inventory of a room. You will remember the sofa- bet you forgot the paintings, the curtains, and the books on the shelf.