Bad phrasing on my part. Zombie Heaven is their complete recordings (all of which were made in the '60s) RIP was later broken off as its own individual release a few years later.
― "...And the Gods Socially Distanced" (C. Grisso/McCain), Sunday, 27 September 2020 20:09 (three years ago) link
...and apparently a bundle of recordings not included in the box were released as Into The Afterlife in 2007.
― "...And the Gods Socially Distanced" (C. Grisso/McCain), Sunday, 27 September 2020 20:28 (three years ago) link