Hi, i have many factory sealed nes games and i found that many late release games (1991,1992,1993) while being factory sealed im 99% sure do not have the H-seam in the back. The ones i have are Overlord(1992) and Wizards & Warriors 3(1993).

If anyone knows for sure please let me know what you know. I know about the camerica and bunch and all those third party games did not have it but these are licensed releases.
Thanks