Bought mine from NYAquatic last month, Michael described it was a 3" Red Sea Regal. It came in at at least 4" but it was nice and fat.
Took almost 2 weeks for it to come out and nibble at the rocks and gravel plus another two weeks to get used to seeing me and another week to start eating with the rest of the fish.
Mind you, I do not have any aggressive fish in my tank, just a pair of Lineatus wrasse and a marine Betta at the time the Regal went in.
No doubt this fish would have perished in a bare QT tank where he couldn't nibble at the rocks, algae and on the gravel.