I think you did excellently. You gave them enough information to keep them happy and make it a positive encounter, you kept your answers short enough that you didn't get into an argument or give them something to harass you with if that was their goal.
I would print out an article about the appropriate method of carrying a 1911 and have it delivered to the police department as a courtesy. They probably don't carry cocked and locked because they aren't carrying 1911s.
Well done and welcome to the forum.