I would love to make this a more comprehensive guide in the future; for now, however, this will have to do. Also, you will not find every console known to man here; pretty much just the ones I'm interested in dealing with.
Also of note is that this guide is only intended to apply to Optic or Magnetic disk media, or otherwise fragile media (such as swipe-cards). Many Gameboy games, for example, have Factory Seals, but as the non-volatile cartridge memory of the Gameboy is highly resilient to damage (that is, after several decades of normal use there will be no practical deterioration) they and others like them will not be considered in this article.
There are several basic kinds of seals used to indicate almost beyond doubt that a game has never been used or even handled before. A Factory Seal indicates that it was sealed at production time by the Manufacturer or Publisher, and that since then it has not been removed. Most manufacturers consider Factory Seals part of their anti-piracy strategy - if the game is Factory Sealed (and not merely covered in plastic), you know it's authentic. However, they do a poor job of educating consumers, and many retailers deliberately remove seals from their stock in order to put the game itself in a higher security area as an anti-theft practice.
There are four major categories of Factory Seals:
| Game Type | Seal Type |
|---|---|
| GameCube (US & PAL) | Folded Plastic |
| GameCube (Japan) | Shrinkwrap |
| Dreamcast | Folded Plastic |
| PlayStation | Folded Plastic |
| PlayStation 2 | Folded Plastic |
| XBox | Security Sticker |
| Saturn (US) | Shrinkwrap |
| Saturn (Japan) | Folded Plastic |
| Saturn (PAL) | Other |
| Sega CD (US) | Shrinkwrap |
| Mega CD (Japan & PAL) | Folded Plastic |
| 64DD | Shrinkwrap |
| Famicom Disk System | Security Sticker |
| CD-i | Folded Plastic |
| Amiga CD32 | Folded Plastic |
| e-Reader | Other |
| PC | Shrinkwrap |