I don't have the OH Rex chip nor the card on it.
The Mason cards I have were paid for at $5 each by Ed Hertel, Steve Goodrich, Allan Myers, and myself. We shared with each other as we got them. We only sent for cards if we had the chips.

If its in TGT, good chance the attributation came from someone other than US.
I have a number of Rex Ids from across the USA Ca, Mo, etc.