I don't have an update, but I did get to watch the (rare?) occasion of my Blue Legged Hermit Crab swapping into a bigger shell, realizing he didn't like it, and swapping back to the original.

Not only did I get to watch it, but I got it on video! I will definitely upload it tonight. Has anyone else seen this happen? I know that mine has swapped shells before, but I have never got to see it.