All the previously listed 2nd issue white MVP Rewards cards from Canterbury Park in Shokopee, MN had a 65mm wide barcode with a 10 digit player number. Just recently another card was found with a narrow 42mm wide barcode that only has a 7 digit player number. The barcodes are actually printed by the card manufacturer since blank cards without a player name printed still have a barcode. So the new found card was added as another variation of the 2nd issue.

Here's a scan of the new found card, plus a scan of the back of the original 2nd issue card with the wider barcode for comparison