I pulled out my copy of the red 50th anniversary "best of" set (dated 2017). According to my notes, here's what's on it. (*Edited show -- I seem to recall that any shows on this set which are not edited, are repeated from a prior set.)
0:51:33 003 Jim Nabors 9/11/67
0:42:41 *025 Imogene...
If you scroll through that site they list every episode included in this "new" collection. I haven't A/B'd them against the ones I have but I am pretty sure it's the same set they've had out there before.
Is it this? A friend sent me this link the other day. I believe this is all stuff they have released before. The red "best of" set came out a few years ago combining repeat episodes with several new-to-DVD ones, but a lot...