The proper way to handle this situation is as follows:
1) Play along. Tell the scammer to go ahead and send the MO and have his driver pickup the items.
2) Contact the police. Tell them exactly what is going on and that the scammer will be on hand the day of pickup, so they should either be there to get him or you will detain him yourself.
3) Have a few friends on hand at the time pickup is scheduled.
4) Hold the MO and item...wait on the driver (scammer).
5) When the scammer arrives, make sure they exit the vehicle to help you load the item. Yell, "oh my god, its coming right for us!"....open fire.
6) Repeat.