We called the Seattle store & hq "the mothership."
Interesting that the crew had different boots... I guess I'll have to pay more attention to the boots on show.
I also had the same impression with the boots seemingly being randomly matched to outfits in the Propstore auction. Propabilia is also selling a couple of pairs of stand-alone boots, I think they are also Tourmasters from what I remember. Tourmaster does make a whole range of motorcycle boots (and their sizes seem to run small), and there are a lot of relatively similar styles out there.
With the rear flap on the boots, it was nice to have that Adam Savage video where we get a better look at them. I wonder how they are attached to the original boot, perhaps with leather glue or something. It seems unlikely that they would attempt to sew them on if they could avoid it as that would be a hell of a job.
Yeah, Adam's video was very helpful especially with IDing the lighting device as the same as in the hand terminals.
It looks like the rear flaps were riveted on at the top. On the bottom they used snaps but the snap bases would have to be set through the leather of the boots and would be permanent. Looking through the auction there are lots of boots where it looks like other pieces of leather were just glued on to obscure the boot a bit and those tend to start to peel off.
Here are some pictures of the hero boots for reference: