Do you keep track of your Neo games?

I mean, where every Neo cartridge you have ever owned has gone? I was just making up some lists tonight, about Neo stuff, thinking about other things while doing so, and began to realize that out of good memory I can recall where almost every one of the 7X cartridges I have ever owned went, whether they're still with me or to whom they got sold to, but generally not if they then got re-sold. Mind you I only started selling at some point in 1999.

Kind of pointless but fun in a way I think. So how about any of you?

I've been buying/selling/trading Neo games and systems since 1991. There's no way I've tracked every single transaction. I can probably go back to the last 2 or 3 months and that's it.