On Monday we re-traced our trip checking with the Lost & Found at the various stores. At the last stop at a popular Office Depot there was still no luck until we returned to the Parking Lot.
There, near where we had parked on Saturday, we
FOUND the chip with it's carrying ring on the
ground. Metal ring was a little "dinged" from
traffic but chip still nearly mint.
Moral: Want a nice chip? Look in Parking Lots!