Perhaps, you couldn't tell if it was AHb or not untill they have established themselves on comb, as a living unit.
I guess though, that you could collect a sample of fifty bees and get your State Apiary Inspection Program to send them off for testing.
Then again, if they don't exist, your on your own. So, you'd have to send them somewhere yourself. Which, of course, you could do anyway.
But, if you don't have a state Apiary Inspection program, maybe USDA would include your data in their file for future possible action. Who knows?