Found the video I wanted for quick set concrete (pour dry into hole around post, then pour 1 gallon of water on top). There are so many other products being peddled out there even with search terms indicating you really do want concrete. Oy. My final set of search terms on YouTube were "no-mix concrete fence post -foam." It brings up the video I was looking for. (Uses Quikrete - something I also should have searched on.)

I'll be helping a friend unload her UHaul truck later this afternoon. She's part of the diaspora who left when the current management arrived at my recent workplace; she's moving back to town after working for several years at the coast (headed for a new job at a different institution.)