At my local CVS I saw 6-8 2L bottles of original formula 7Up with the yellow KfP cap bottled by Pepsico. It was mixed in with the regular caps. Never seen that before. When I checked the ingredients it still showed HFCS rather than sugar. Is this product really KfP or did the bottler run out of regular caps?

They most likely ran out of the HFCS caps.

There was a KP 7up, a few years ago.

Also Canada Dry 6 packs had KP on them but still had HFCS in the ingredients last year. That was a printing mistake, so maybe 7up is still KP in some markets.