The 'pixelated' look is actually a sign that the item was re-shot. Exhibits are half tone prints. A photo is annotated with artwork:
Then re-photographed through a screen that imposes very fine 'dots' over the image:
If you want to counterfeit a half tone print and you don't have the original you reshoot the card itself. That will result in a loss of quality because a copy of a copy loses resolution. Hence the dirtier grainier look of a fake. It's a second screening of the image.
The other issue is card stock. 99% of the fakes do not get the stock right. I guess the polished tan stock that ESCO used is not readily sourced.