I bought a Red Sea Regal over 6 months ago. Very challenging fish to get eating. Mine would only eat clams on the half shell for over 4 months. Finally at 6 months he is eating most foods out of the water column... Mysid, pellets, Formula 2 Frozen... Ect..
Sounds like the fish got overly stressed in the bucket... I would take a stab at it again, and wait for one that has been at the lfs for at least a few days, and seems semi interested at eating.... Ask them to get you a Red Sea or Maldives..... They will both have a yellow face. They fair much better in the home...