Well I know why I didn't get an answer when I phoned Michigan Plating and Stamping. The letter I mailed to them came back. The building is vacant. But you know I bet it wasn't vacant long, otherwise I wouldn't even think the phone would ring. Also, when you google the address it looks like they are in business. Those google photos probably aren't too old.
Anyhow unless I could figure out how to investigate old sales records the trail is dead. We may never know, especially since we recently lost Mike Wallace. He could have found out for sure.