A sealed game is a box with shrink wrap. Opened, it is a game night. In the overview Security for collectors the same rule applies as with LEGO: the condition of the wrap is the price.
Storage
Dry, dark, little pressure, not on a damp floor. Do not lift the wrap "just to check".
If someone comes
A shelf full of games is slow. A small row of rare, sealed editions is one box. It does not stand by the door. It does not come up in the radar. The list names the rare numbers with proof.
The folder
Title, year, language, sealed or open, proof, photo of the wrap.