Restocking (and selling!) with the Loreen Inventory Control System

First one of these I've seen still in the book that made its way downstream into a second-hand market. It should have stayed with the bookstore when the book sold per instructions on the card. 

This is an inventory control card—the key piece in the Loreen® Inventory Control System (as stated on the card) for reordering books.  Instructions at the top of the card inform a bookstore worker how to insert it into the last copy of a book as a flag to the cashier to restock that book. The system’s namesake, Loreen, is an elusive figure or name applied to the system. Research comes up empty on the origin, but the system was a proprietary, trademarked inventory method (indicated by the ® symbol next to the name on the card) likely named after a creator, a company founder's family member, or a stylized trade name.

As to why Loreen’s card stayed with the book instead of the cashier, a couple of  reasons could account for that.

One, the card was not placed in the book where the cashier could see it or the cashier just forgot to take it out of the book. Human error and the system failed. The book eventually found its way to a second-hand market. 

Two, the book's sales did not meet expectations, and remaining stock was sold or donated to a used bookstore, a thrift shop, or a "remainder" discount bin and the card rode along with the lot as a souvenir out of view. The Loreen® Inventory Control System would not be necessary in those settings were the card even discovered.

I bought the book at a second-hand shop and found the card while thumbing through it probably for an autograph by the NFL player who wrote the book. I found the card instead and thought it an interesting piece of ephemera to have survived with the book beyond its intended purpose. While that card may have failed its original intent, it did sell the book. In that case, it was a success!