On top of the weapons he had 150 chainsaws...ol Rusty thought he might have planned to start a riot, more likely field a brigade!
Though if the guy was originally had been on the police radar for drug smuggling it is entirely possible that the found weapons were 99.9% hunting rifles and shotguns because the other stolen weapons had been going out with drug shipments. The hunting weapons would have had limited gang/cartel value.
Nice the police are going to try to match the weapon with their rightful owner, but looking at the photo showing a pile of long guns stacked several feet high, they most likely won't be in the same condition as when they left their proper owners.