Sealed gameboy games

[joedick]

Do all sealed original gameboy games have the seam, on the back? I have a bunch that have the seam along three sides, but the few that I've opened looked pretty new. Are they reseals?

[Kyle15]

They are official seals, as far as I know.
Nintendo used that type from GB up until the DS.
I've never seen re-seals that look like that. ;)