I keep the boxes for anything I buy, and I put the receipts in. I do this for 2 reasons: warrantee and reselling. If my item breaks, the company will often ask for an original sales receipt to fulfill the warrantee, knowing full well that most people throw theirs away. Also, if an item of mine outlives its usefulness, I can sell it on eBay as "in original box, with all packaging and paperwork," etc. My OCD-style hoarding has rewarded me on more than one occasion, so I literally have about 25 boxes for small consumer items with the receipts tucked in. Fortunately I have plenty of space.