I finally had time to scan my Foyt Marhoefer card. The lot I won at Sterling are my first Marhoefer cards. The cards are thick, rigid cardboard; that makes sense since most of the cards were using as a backing for packs of wieners.
Cards do exist that were never placed in product packages, but all the cards in the lot I won were definitely inserted in packages. The cards may not be the nicest, but a Foyt Marhoefer is tough to come by in any condition.
If anyone in this thread in interested in a type card sample other than A.J. Foyt, I would sell an example for $20 net delivered.