I've heard of people seeing and killing them there, but I dont know of a single person that has actually killed one. I would compare it to Tahr on Mt Taylor, but i know someone that has actually killed one up there.
Was down there in February and again 2 weeks ago. Didn't spend too much time on the Pecos proper, but brushy washes west of Carlsbad. Weren't looking for pigs, but didn't see any sign. There's a lot of habitat, and a lot of it's BLM. Must be pretty low densities. I'd like to try for one some day though.
As said They say they are here,I've never seen one off private land. Never really even seen pics pigs of in trucks etc., besides few private.
I've seen a few of them on ranches on the Pecos & Rio Grande....again never seen many pics besides G&F of a dead one.....with one exception, guy I know & he is quiet about it..........too quiet...lol
Seen more elk & sign than pigs in that desert country along the rivers. Not even enough quail sign to bother.
Think they are as common in NM as Thar as stated.