Hermit Crab Squatter

So here's something new to me.
I have a blue leg hermit that's taken up a margarita snail shell, about 5/8". About a week ago I found him sittin on a small nook of a red monti cap. After a couple days, I decided to move what I thought was maybe an empty shell, worried it would stunt growth of my coral.
So last night I moved the shell to my sandbed only to discover that it was still in there, and alive. I wake up this morning, and there it is again, sitting in the SAME SPOT on my monti cap.
Any thoughts? Think it laid eggs? What??????
 
I know a couple of my snails during the day always go to the same spot and one time I did catch them mating. See video below.

[video]http://www.youtube.com/watch?v=-RdKGXa4HKU[/video]
http://www.youtube.com/watch?v=-RdKGXa4HKU
 
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