Getting a passport at a post office,i have not witnessed any such activity....
Are the passport photos postage size?
When I first got mine, I used the post office but had to bring in my birth certificate.
From what I could see, the person at the front of the line produced no birth certificate but did seem to offer utility bills, etc.
I might also add, as I have here in the past that this is the same area where Hispanic groups line up at the DMV to get driver's licenses, again bringing along a 50-60 year old, non-Hispanic woman to speak for each of them.