Full disclosure: I'm a Hoosier, and that's the connection that got my attention in the first place.
Full disclosure: I'm a Kentuckian and our basketball is better
It is pretty easy to get a handgun permit in Indiana. You really don't need much more than an address and be able to pass a background check (which NF clearly could). Interestingly, we do have a non-resident permit, which is more expensive, but I don't think it would show little old Butler, Indiana, as the address if he didn't use an actual address there.
The closes gambling establishment is the "racino" in Anderson, but that's still pretty far away from Butler.
Looking at the map, one way the Butler connection could become more meaningful is if there's a link to Detroit. Given the patterns he would have to drive between the established cities, Butler only makes sense if he's going up I-69 (yes, that's a real highway) to Detroit.
ETA:
Or Toledo. Or Cleveland.
Yeah, when I first read "Butler" I thought it was strange because it's so far north in Indiana, it seems to be the furthest Northern point associated with NF (on this side of America, at least). This is what makes me think that the permit was only for a guard-card for a job he was possibly applying for. It seems strange that he would live on the western side of America, spend on year on this side of America (while holding residency in Henderson) and then go back to the west.