While I suspect he’s making it up, there is this: https://comics.ha.com/itm/original-comic-art/comic-strip-art/erwin-l-hess-the-good-old-days-sunday-comic-strip-original-art-dated-5-21-60-united-feature-syndicate-1960-take-a-charmi/a/15082-17934.s?ic3=ViewItem-Inventory-BuyNowFromOwner-ThisAuction-120115
While I suspect he’s making it up, there is this: https://comics.ha.com/itm/original-comic-art/comic-strip-art/erwin-l-hess-the-good-old-days-sunday-comic-strip-original-art-dated-5-21-60-united-feature-syndicate-1960-take-a-charmi/a/15082-17934.s?ic3=ViewItem-Inventory-BuyNowFromOwner-ThisAuction-120115