Hey bay,
I also picked up some house flies a few weeks ago, and had them hatching within 3 days of having them.
your temps should be fine in arizona at room temperature.
they could be freshly pupae'd which means it could take some time, i don't know what kind of time length they take to go from larvae to fly but it might be another week or so.
put a 60 watt house bulb on em , it might speed up there change.