Your our $23, it could be worse. But I do understand why you want the money order back. I would contact your bank/whoever you got the MO from and ask them if there are any issues that you the issuer could be responsible for if it was used fraudulently. Give him 48 business hours. Otherwise contact the authorities to see your options, theres a good chance they may not do anything though because, really no crime has been committed you just think there has.
If anything, get is AV status revoked.