Can the animal be injured and probe male? Absolutely Will the animal still able to breed? Yes
Did you probe on both sides?
Now chances of a female being sold as a male is less likely than than the opposite though it can still happen if the seller sexed the animal once and put the wrong label on it and never re-sex it before shipping.
What I would still encourage you to do is to have someone pop the animal, I am sure you can find someone local that can do it for you and teach you in the same time.