I've posted my story on this before elsewhere, but to encapsulate:
I was at a record convention in Cranford, New Jersey. Started driving to it around 1987, so the time frame would be thereabouts.
I was toolin' thru rows of 45s, all alpha-order by group / performer. As no one was at this particular dealer's table, I started at "A" and made my way on thru the boxes. I was at mid-alphabet when a group of guys started from the other end. They looked to be mid 30s age (I often think it was a crew of bob Irwin's pals, maybe even him?) as I was lot younger. One dark haired guy pulls out a Richard & the Young Lions 45, and then goes "Wow, I need this one - The other guys were all trying to keep their excitement low-key. I looked over when the guy held it for inspection, it was the Remains "Say You're Sorry" / Talkin Bout You" 45, white label promo. Marked $20. After the guy paid for his 2 45s I aksed him if he would re-sell it to me for $40, and he laughed and said no.
Also, another collector pal who worked for Sony for decades told me the master ledger card for Epic 9777 shows the release was pressed as a promotional copy, but quickly recalled. It was probably issued by mistake. No manufacture amount is notated. I think there might be one in their archive.