Way back when, promo cassettes were sent out in huge numbers, and they were often on decent quality chrome tapes. Major labels had sizeable budgets for this sort of advertising. If you got on one of their lists, you probably got on many lists. Radio, college radio, record stores, etc. It would have been easy, and smart, to ask friends around the industry to hand over their supply rather than sending them to landfill. Everyone wins. I don't know how RRRon worked this series. It's surprising more labels didn't do this. Using your resources at the utmost. Not something common then, but especially now.