I also dought it died they are crafty. And a hairy hitch hiker crab sounds bad. I had one that took many nights of searching to find. I kept hearing a tapping noise after lights out and thought it was a pistol or mantis shrimp. It turned out to be this crab was inlargering its hole. They will increase the holes size as they grow. If you know the rock its in a high salinity dip or fresh water dip might help bring it out .
Heres an ID site. After you open link look on the left side and click the site info tab and then again on the left look for hitch hiker tab. GL..