I'm not a console or old skool collector so my input may be worthless to you but I have a couple tips for games.
- I've found that sealing items in some kind of poly or cellophane is good but they need to breathe, if you seal things, especially already factory sealed items, you'll want to allow some air flow. If you don't do this any moisture buildup will be trapped inside. I usually cut 2 or 3 very small holes in the poly/cello bag...Usually at the corners.
- Keep them out of direct sunlight, I have a few in my collection that have discoloured quite badly because of this. There are UV protective cases available but they are very expensive and only worth buying for very valuable games that you want to display.
As for old consoles/computers I have an Amiga 500 and an Atari STe 520 that are almost as old as me (30) and are still in perfect working order. I keep them and their respective game discs in modded suitcases
