I'd like to maintain anonymity when shipping so I don't want to go to the post office each time I need to ship something.
I asked around at a few local POs about first class mail since it's cheaper than priority but they said you can't buy the stamps and apply them yourself. You have to bring your shit in each time so they can inspect it and apply the stamp themselves.
If I'm trying to minimize exposure to the PO what are my options?
I have a bunch of tracking labels already (label 400s).
Can I buy a bunch of those prepaid priority envelopes or boxes at the PO and then apply my tracking labels myself at home before dropping my packages off at a shipping box?
yes
no
maybe
let me just do your work for you : )