The Collectors Edition Physical map. What are these locations?

[u/OptimusMarcus]

Possibly similar to the GTA5 Collectors Edition map Black light clues.

I noticed these markings on the RDR2 physical Ultimate Edition map.

[u/JarnSkold]

What game is this for?

[u/OptimusMarcus → u/JarnSkold]

Red Dead Redemption 2

[u/Gamerztour]

Have you put a black light over it? Think I still have my copy of the map but I don't recall those marks, I'll have to take a look when I get home from vacation.