 file folder or a shoebox or a drawer or something. You even go through these now and then and you call out some of those items that are no longer in service. Oh yeah, that's right, I broke that. Or oh, I bought a new one and I donated that one. If you're really good about doing this, when you do get rid of something, you go back to this box or bin or drawer and you find that owner's manual and the UPC code and the serial number