About the ending...(SPOILERS)

Again, SPOILERS!

Okay, can anyone help me out with the very end of the film? We have two characters walking through the desert looking for something that wasn't described? Were they looking for the mailbox? Were they looking for the hangar?

I quickly picked up how the two BP agents that debriefed Flores suggested the exact same places for relocation that both Davis and his predecessor were offered, (remember the guy getting smashed in the head at the very beginning of the film), as well as the near disappearance of the keys of cocaine they carried around in their truck for most of the flick, leading me to believe they were working with the cartel as well.

But I couldn't figure out what Flores meant by "We'll catch them in the wind" comment to shiny new Border Patrol agent Jaeger, who made be nervous as hell toting a shotgun behind Flores.

Who/what were they looking for?

Or, did they flip Flores who was bringing out Jaeger as another courier for the cartel to recruit?

Very ambiguous that ending scene....