This point looks pretty good to me, but I'm fairly sure it's not a NM/AZ point. It most resembles the Texas southwest square base Lange, of which the horizontal transverse flaking style is common. Overall, based strictly on the photo, it looks real good to me. You mentioned going to a show this coming week-end. If your talking about the Fredricksberg show, I will be there as a vendor. Come by, and we will get Dwain Rogers to look at it for you. Then we will know for certain. What a nice present to find that way. I guess I'll have to start looking in abandoned buildings!
Gino, no Hardin I have ever seen has that square of a base, and on most,the sides of the base are concave. All others are straight, but expanding. The flaking style (fine percussion with beveling) does not match as well.