To be honest - none, why should i?
I have a couple of boxes lurking around mostly Intelivision games i obtained with the console a couple of years ago (console #3) a few Amiga games have still a box which i kept it over the decades mostly to store the manuals due to that they still exist (divorce and all that turd). But no boxes of DOS games are left (that is i wasn't a doze user but had three games for my dads PC, SimCity, SimEarth & Populous, Simearth incl. box, manual & "daisy planet" he gifted to a kid while i was off for a decade or so). Thus "why should i?" not enought to really take care of them.
Database? for the repeating same five games i play? Does that make sense?
What i recently guess of is to keep track of my saved games (amiga script project), extract some data and to make of this a game specific database.
I understand the need for it, this i do.
But i simply never cared much for cardboard it's the software which i like.
Some other even collect shipping boxes...
The opposite is me "no matter how the data is stored as long as i can play it"
or fiddle around with it.