Museum pieces are items you find in certain zones (for example Wrothgar) and you then place them in its museum, and you get things like achievements/costumes/collectables once you find all of them depending on the zone.
You are supposed to drop the pieces off as you collect them, or collect some.
As for Tracking the items you have, there is an Achievement in the Journal that checks off the items. Usually you have to turn them in to get the Check on the item in question.
lethality_ESO wrote: »Museum pieces are items you find in certain zones (for example Wrothgar) and you then place them in its museum, and you get things like achievements/costumes/collectables once you find all of them depending on the zone.
OMG. I had no idea this was even a thing... museums!? Ok, I'm in. Except I think I might have tossed some museum pieces