2 lb. block of Dry Ice. Put under cover, in top super. Pull a garbage bag over the hive, tape down. Will suffocate the hive without harming the honey. I have done this to a AHB colony in ?2007, after getting the tip on this forum.
Interior San Diego county has endemic AHB. Blue was the keep that was stung so badly he passed out at the drug store looking for Benadryl. Saved by the paramedics.
Save a jar of bees, so the AHB quick tests can be run. This is measuring the length of the forewing (over/under 3/8")
Strong hives, ready to swarm, in California dry heat (it was 108 in the interior of my county this weekend) are aggressive and defensive. Placed in an out-of-the-way yard and left alone, the hive may somewhat recover its composure. But more likely, Blue wild swarms, and naturally requeened hives have gone AHB.
That said, most hives will lose defensiveness if split down to nucs. All the queenless ones can be requeened with known gentle bloodlines.