Just when I thought it was over

Well after yeterday's post you wouldn't have thought there would be another one so soon. But here it is. Yesterday I wrote the entry just past four thirty, which was about ten minutes after I had checked to see if Mr. Groundhog had redug his entryway. After writing it I was secure in the knowledge that he was probably gone for good, having not made an appearance in four days. Two hours later I took some parings to the compost, glanced over to the corner of the shed and was flabbergasted to see his hole open again. Did I assume he was in there? Do I wait til dusk to make sure he is home? Without a clue I simply set up the trap. If he was there he would encounter it when he came out, if he wasn't there and wanted to get back in he would have to go through the trap. This morning the trap wasn't tripped. I did notice that there was some dirt over the trap's base, which wasn't there when I set it up, so he did encounter it, but didn't set it off. The trip mechanism did appear to be slightly stuck, but it isn't a mouse or even a squirrel. A groundhog is a larger animal and I can't see how he could walk over the trip mechanism without setting it off. So, I reset the trap, left it in place, filled in his hole again, and will wait to see what happens this evening. Based on previous tries I expect this to be fruitless because it is obviously not his home and he is only there on occasion. I have no idea why he keeps coming back. Is it just to use as a safe haven when he is far from his home? Someplace he can run to if a predator is after him? Don't know, don't care. I just want him relocated.