You don't know that, he might beI'd return it and never buy from him again. A 1911 is actually unsafe depending on the type you have with a round in the chamber and the hammer down. It can actually fire if something hits the hammer like the pavement on a fall or a mistake by you trying to decocking it. Some have firing pin blocks and some do not.
And why is this holster it? Why is it either this holster or leaving it at home. Get another holster from a reputable company. You aren't married to him.