Wow.
Guys are tight lipped about OTC barb spots. Asking for an OTC ibex spot is like asking to borrow a guys wife.
I only know 1 guy who's even alluded to OTC ibex and even then he was incredibly vague. Most people probably wouldn't share an OTC ibex spot with mother Theresa.
Unless you live in Deming and can start exploring daily or weekly, you'll likely find a unicorn, bigfoot, and a shelf full of primers before an OTC ibex. Even if you do live in Deming you may find 2/3 before the ibex.
More seriously though, if you do find one please post a report and some pics (without sharing the location or even that it was OTC). That'd be an awesome accomplishment.