Go talk to your locksmith and explain the situation. Have him visit the wash and all your locks and the one in question. If he is a medeco dealer I would bet he would make the keys for you. I have mine made locally and have been in the same situation.
I've dealt with a local locksmith on such a matter and the last thing I would do is let him know where he can go with the key to open something. I had put Medeco deadbolts on a
door and needed extra keys, so I took one to the only locksmith in town who could copy them to have some made. He looked at the key, then asked with a very creepy, suspicious grin, "What does this go to?" I told him it was none of his ****ing business, and I paid with cash.
A locksmith who is Medeco licensed can get copies of a key made only if the blank type is not controlled. The situation is not the issue with them - they don't decide who has a legitimate right to copy the key and who doesn't.