That affidavit for the arrest warrant is damning in what it doesn't say.
On Nov. 9, 2010, 40 firearms were "seized" by the ATF (Paragraph 8). Yet on Feb. 15, 2011, SA Jaime Zapata was murdered with one of those "seized" firearms (paragraph 9)....
I don't think this is an accurate reading of these paragraphs. Paragraph 8 refers to a number of firearms with obliterated serial numbers being seized including "12 Romarm 7.62 pistols, Model Draco C (oblieterated serial numbers)." Paragraph 9 refers to three firearms used in the assault of Zapata including a "Romarm-Cugir, model Draco, 7.62 pistol, with an obliterated serial number." There is no express or implied statement that this was one of the pistols seized earlier.