On day 3 of the mission, you record the burning of the Mendoza's money that is inside of a vault. During this time, you can open up some deposit boxes. By chance, one of the boxes can contain a picture of what looks like hockey players. You can even pick it up as if it was loose loot, but no notification of how much it is worth pops up.
The picture of the picture is below:
I believe I have also seen this picture on one other mission, though I don't remember which. What is the point of it? Anything at all?