I'm a bit of a pack rat - but an orderly one. I like to make sure I keep receipts for just a bout everything I own in case the house burns down - however they are not kept in a fireproof boxes. Don't worry I'm aware of the huge problem this presents.
A good way to protect your literary investment is online book cataloging.
Kimbooktu has done a far more in depth search on this subject than myself. To see her reviews and find the right site for you follow the source link.