I would be more concerned with the appeance than the smell at this point.. It is obviously a fresh mount that ideally should still be at the taxi drying. Turkeys are Turkeys, and try as you may sometimes they may have an odor during the drying stage.. it only takes a small amount of flesh left in the wing to produce an odor.. Borax and other injectables will bug proof it to a degree, but does nothing to mask the odor other than being an astringent to help dry the meat faster. I will admit myself, that I have had more than one turkey out of the many I have done, that have had odor. In the shop it isn't an overwhelming odor so long as the air is circulating, but once you put the mount in an inclosed space, (ie: car during a heat wave) that same odor that wasn't too offensive in the shop can be gut wretching.
Like stated, in 2 to 4 weeks (depending on the humidty,) the odor should dissapate.
Now as far as the appearance... If the bird is still that moist, chances are feathers may move and go astray as it dries. This in turn can make an already unappealling mount even less desireable.
I do not know the reasons the mount was let out of the shop wet, but I would definately return it until it is dry so that the taxidermist responsible can tend to it while it dries.
Now.. the next part of the equation... If you were truely unsatisfied with the mount and noticed the odor before leaving the shop..... WHY DID YOU ACCEPT IT?
? Did you see pictures or other turkeys in the shop before leaving your bird? A duck isn't a turkey.. and a good duck taxidermist isn't always a good turkey taxidermist. Good turkey taxidermists are usually expensive and definately worth shopping around for. If the taxidermist you chose is capable of putting together a bird that you saw and were satisfied with, then you should return the bird and request an explanation. Maybe it was lack of attention on the taxidermists' part, maybe it was the quality of the bird to begin with. Even the best turkey taxidermist can be hard pressed to make a less than adequate specimen look appealing.
Anyhow.. good luck to you however you proceed.