I would say more than two were forged since FactCheck used different papers in their photos.
Cal, I think what’s happening with the coloring here is due to the film and paper I mentioned. Using the same make and model camera as Factcheck used, I took photos under several different lighting conditions and got the results in the parenthesis (shown below).
They printed the forged COLB image onto a sheet of SafMat or Reprofilm, which is partially reflective, and then attached it to photo paper (more likely) or security paper (also likely).
I shot my photos under different lighting conditions resulted in these color changes: under incandescent light (yellow to orange tint), flourescent (pea green tint), indirect roomlight (grayish tint), indirect sunlight (light green) and 5300K photoflood (true color, but only used for photo #3, which is way out of focus).
However, my COLB is a real COLB so it’s not going to exactly match what Factcheck took, and IMHO, it’s the reflectivity of the film (and/or the paper) under strong, incandescent lighting that made the COLB look yellow.
My shots under incandescent tended to be more orangish than yellow.
The reverse side is definitely a different document, but even here, photo #9 was taken in a room with indirect sunlight.
They carried this thing from place to place.
Another discovery I made is that it is impossible to go from a front side shot of a COLB object to a close-up of the reverse side in only 15 seconds (as indicated in the Exif data), given the time needed to crop off the top 1/3 of the Seal and the time to get it all in focus.
Heck, it takes from five to seven seconds to frame, focus, snap, capture, and store just the photo itself.