“The ATF will now look for serial numbers on the weapons to try and track where they came from.”
Ah-ha! So that is the elusive 2nd step in the ATF underpants-gnome Gunwalker scheme. We can now see clearly how this operation would work:
1. Sell assault rifles to Mexican Drug cartels.
2. ????? = (Wait for criminals to forget a duffel bag full of weapons and hope someone finds them and reports them)
3. Track where the weapons came from and make arrests.
I think this is the 3rd duffel bag find in Starr county.