No one has ever claimed any of the F&F firearms even had a tracking device. The whole purpose of flooding the Cartels with throwdown guns was so they could be traced back to support the meme that their weapons came from the US, not only, IMHO, to support an anti-gun agenda here, but to push the UN Small Arms Control treaty and blame the problem on American gunowners and dealers.
In F&F only two guns ever had tracking devices in them. They were put there by an agent, on his own, using electronics he got at Radio Shack. He did that because his conscience was bothering him about letting guns just disappear over the border. They failed. Either the batteries died, the guns went too far to send the signal or the devices were found.