According to AI, there are approximately 560 zip codes in Arizona.
On possible way to generate an approximate suspect list is to generate a list of online customers who have ordered either the specific daypacks or the specific balaclavas from addresses with the same ziocodes.
Unfortunately, a rigorous application of this method could result in some false positive suspects…
The clues so far seems to point in two different expertise directions— both professional and amateur.
This apparent contradiction could potentially be resolved without contradiction by positing the holding of a gang initiation gone bad and requiring a cleanup.
(There is a relatively recent movie centered around this theme but I cannot recall the title.)
The daypacks are also available in brick and mortar retail Walmart stores according to this article: