There is a tombstone located in the bottom left of Orlen,
Does this have any use (ie Codes,unlocks etc) or is it just for show?
There is a code, you have to play Dragon Island Blue to get it.
Ahh that makes sense.
thanks 
No problem, when you get it, it should be under the black market
Is the code you’re talking about the “golden egg code”?
No, it talks about “Don Penguini”
Too late but the code is dragon island