The way I run things is (at least for larger orders) I have the client send me an overnight or 2 day FedEx label to an anon email. After we settle in sats, I pack up their goodies (double vac seal and sealed in bubble mailers), forward their label into the FedEx store I’m dropping at, and ship in a well-taped up FedEx box. The overnight or 2 day labels are expedited and they appreciate those customers. 

I’ve been doing it for almost a decade and haven’t had any issues. I have the client use a dummy return address obviously. They don’t ask for any id and since the label is already paid for when I go in to drop the package they just print it out and stick it to the box. No KYC at all.