I'm not sure about Agkistrodon, but I do know that Crotalus has definite home ranges, and if one is relocated too far away, mortality is high...I would suspect the same is true for coppers and cottons, but have no evidence indicating this...

When I relocate rattlesnakes from people's houses here in Az, I try to relocate the animal no more than 1/4 of a mile from where it was found...I don't find alot of "repeat customers" with the same snake....

I guess if you're intentionally making your property attractive to snakes, then one can't be too choosy as to what decides to show up....best of luck.

-AzAtrox