Well, if it's a no kill shelter they should take care of him 'till they find a home for him.
We did the same thing but in reverse. Thought we were getting a female, named her Daisy. One day while "she" was walking around I saw something....hmmmm, what are those?
Not a girl at all. Couldn't believe I never checked, just took the shelter's word for it. Well, we kept the name just changed it to Dazy.
He lived a long life, got kind of fat and was my daughter's baby 'till he died 10 years ago. Sad sad day.
Good old Dazy.... No claws but he could intimidate any dog out there just by his attitude. Yet he was such a calm boy he let the kids dress him up and do just about anything to him. Never knew a calmer cat since.