The POSTAL BUDDY Cards were an experiment with self-service machines. The machines were privately owned, and used under contract with the USPS. The system was very popular and APPEARED to be working well when the contract was suddenly cancelled on Sept. 16, 1993 and the machines were taken out of service the next day. The reason given at the time was "insufficient revenue".
There is a note in both the Scott and UPSS catalogs to the effect that after the contract was terminated, the Postal Buddy Corporation sold off everything they could including promotional materials and pages with BLANK FRONTS (and Postal Buddy printing on the back). We are warned that a person with a good laser printer COULD make counterfeits of errors, freaks, and ESPECIALLY THE FINAL ISSUE (The CVUX4 and CVUX4a in my numbering system). These last 2 cards were available for less than a month when the contract was terminated, and are both scarce. But...
...you don't need to worry about the cards I sell, because I HAVE THE RECEIPTS for the purchase of most of what I have in stock. The dealer whose stock I bought out lived in lower PA, and made frequent trips to the Washington/VA area, which was the heart of the Postal Buddy "Empire".
The receipt at the left is dated September 7, 1993, which was only 9 days before the contract was cancelled, at which time the machine was selling the scarce #4 and #4a Postal Buddy Cards.