What about something like this? https://docs.google.com/spreadsheets/d/1DtPITPiszqnPNj-s55aC2DievqRGn79yj9NXdEU--4o/edit?usp=sharing
That's just a live spreadsheet. Under the 'dumped' category, we can select: Yes, No, Secured, Unnecessary
This list can easily be kept private and only the dumpers of handhelds can take over access to it, and people who want to add to the list/access it can request access. Also, we can give people comment access, and people just leave a comment over the game they've secured. It'd be easy to check what people have got.
It can have notes, CPU, images of the handhelds, etc.
We can keep adding as many pages as needed.