When Encampment is set aside, it still counts as belonging to me for the purpose of Wolf Den for example. Only after my turn, the VP tracker adjusts.
I think it should be accounted for already when setting it aside, because there's no way that it doesn't leave my deck at the end of turn (not even if possessed)?
If you bought Encampment from the Black Market, it will remain set aside forever and always remain yours.
Ok, edge case found. ;D
In the other cases, I'd still correct it.