Having watched Gilligan in daily rotation for the better part of 10 years on a Spokane channel through the mid 70s to the early 80s, I always liked having those Season 3 teasers before the opening title sequence. It always has irritated me that WB, Turner, or whomever moved the majority of...
I have the last 2 reunion movies from alternate sources, and both of those have Universal Studios tags on the very end of the movies, so the likelihood of a truly complete set with all 3 movies is slim, unless WB bought or licensed them from Universal.