Completed the Art portion of my Museum

[TheSillyPuppy]

Congratulations on completing the museum
My guess is the 20% thing is on top of the other RNG right? So it's actually a bonus?
It would make sense that you have a 20% chance to have a guaranteed real version of something you need and the rest being random?
Anyway good for you
I got impatient and decided to start trading lol

From a programming perspective, I would guess that they programmed the RNG to roll for the four pieces of artwork first (where the 20% chance of a non-donated piece to spawn is taken into account), then roll for whether or not the four spawned are real (so the two probabilities would be multiplied with each other).
Otherwise, if all the art (authentic and forgery) were rolled from one pool, there would have to be additional logic to account for the scenario where both the authentic and forgery versions of the same piece of artwork were rolled.

 

[Bilaz]

Ohhhhhhhhhh I see thank you!!! That makes sense