The USA Box Scans (in Goodtools format) for Gameboy Mono and Gameboy Colour are now done. These were done for use with CAVE's Mamewah skin.
Gameboy Mono - 282/553 USA Box Fronts (181x181 resolution)
Gameboy Colour - 451/547 USA Box Fronts (181x181 resolution)
get them
here.
These are all I could find from scouring the net. If anyone has any of the missing box scans please send them to me.