Managed to scare-up these photos. The first shows a genuine Sherman IC (Hybrid) with the fake muzzle brake and disruptive camouflage:
The second shows a Firefly with some interesting graffiti.
What is interesting is what isn’t present. To borrow from Sir Arthur Conan Doyle:
Inspector Gregory: Is there any other point to which you wish to draw my attention, Mr. Holmes?
Sherlock Holmes: To the curious incident of the dog in the night-time.
Colonel Ross: But the dog did nothing in the night-time.
Sherlock Holmes: That is the curious incident.
[“Silver Blase”, 1892]
There’s graffiti but no official markings on the side of the tank. Ben, I suspect (based on having a honking cannon doesn’t make your armor any thicker) that their markings were muted to the point of being erased.