ATF is asking the public to send it social media posts, photos or any other information related to the theft.

Knight said investigating a theft from a shipping facility is more complicated than a gun shop, for example, because weapons at gun stores are isolated in inventory.

“It’s a very tedious process that we’re looking at to make sure that every firearm is accounted for, from the shipper as well as from the receiver,” Knight said.

Authorities spent Monday following up on leads, which is why they say they didn't have time for an interview.