I realized that I only have a epic Bim Silverbottom. Is this possible or a bug ?

I also though that they are unique but I have all Silverbottoms in two musuem. Maybe that's why he's only Epic ?

Thanks. That's possible.

So unique means museum unique and not unique for them all ?

Unique seems to mean closer to “one at a time”. You can have one per map, and they are replaceable if you sell them or they lose patience and leave.

Thanks. Haven't really tried to get the others in other museums but was a bit surprised. Guess I'll sell my imperfect Bim and try again :D