In the briefing room swat members say the criminals purchased stolen fostech origin 12 shotguns from a dealer. When the criminals are seen getting the weapons out they have aa-12 shotguns which are a different weapon from a totally different manufacturer.
Recovering the missing DNA kits would not help. An important part of their admissibility is an unbroken chain of custody, from collection until being admitted into evidence. Once stolen, the chain of custody was broken, and could not be re-established. All those kits are useless.