The common abbreviation for Flintstones: Surprise at Dinosaur Peak (a.k.a. Flintstones 2). I know we have the PAL/Scandinavian version but we don't have the NTSC/USA version.
That's going to be a tough one, or we just have to find a "nice" collector that is willing to scan it for us.

Are there that many differences in the two boxes?
I'd also love to track down some scans/boxes of the other toughies I need like Bomberman II, Wayne's World, Godzilla 2, Gun Nac, Bandit Kings of Ancient China, L'Empereur, Pro Sport Hockey, etc.
Oh yes, I'm in the same boat Wolf. I've been looking around for some of the tougher boxes to get scans for. I'd love to get/see scans for BomberMan 2, Gun Nac & Pro Sport Hockey!
I'll see if I can persuade (i.e. pay
) some NA members to scan some of their less-than-minty boxes for us.
I've tried this in the past with mixed results. Some users are more than willing, yet don't have a scanner. Others think you're using the scans for some sort of scam, or a way to somehow make money/profits or a knock-off box or reproduction. In most cases, many users I inquire with simply ignore my messages.

One other issue is of course after you get them to agree to scan the box, to have them scan the box properly - at 600dpi, and have various settings on their scanner set up. I keep trying though. I think if we keep plugging away, we can definitely shorten everybody's want lists for covers!
....but ya, I'd love to see most scans for some of those "toughies" (as you put it) for the NES...
Keep up the great work!