Forgers Forge Forgeries

OK, it stands to reason that the Iranians are sending equipment to their friends in Iraq. And so we've been told for several years. Yet when the Brits decided to go live out in the desert near the border recently, and check for themselves, they found nothing. Of course you can't prove a negative. On the other hand, if significant shipments were crossing the border my hunch is the Brits would've spotted (and interdicted) them. Proving once again that intelligence based on at-a-distance analysis may have significant shortcomings, not to mention its susceptibility to hyperbolic claims.