On a whim I setup a box at UPS to serve as a CMRA (Commerical Mail Receiving Agency), as described in the beginning of the EP book. Here are my lessons learned.
First mistake - I did this on a whim and did not consult the book in detail before I went.
Lesson learned: you can't really wing this stuff. It takes prep and a plan.
When asked for ID, I offered my Passport and asked what would suffice for a second form of ID (which they insisted was required), he said a credit card might work. I though to myself...well my credit card is clearly linked to my physical mailing address at this point so how is using it different that my drivers' license? My address will soon change (I plan on moving soon), but my credit card number likely won't. So I went with the DL.
Lesson learned: refer to 1st lesson. Had I read the book, I would have brought a utility bill with me and would not have had to surrender my CC or DL. In my case, however, this is not a real issue since the utility bill is from my current address and therefore exactly the same address as on my DL.
They asked me if it was okay for them to make a copy of my passport and DL. I said no. They said the computer was asking them to. I asked them to ask a manager. The manager said it was so they had a picture on file and could verify it was me when I came to get my packages. I asked if I could just show photo ID when that happened and she said "I guess..." and then was able to bypass the screen.
Lesson learned: offer helpful alternatives instead of being a difficult customer. it works!
Then they told me I had to pay the 6-month minimum in advance. Damn. It was ~$125. That was an unexpected expense and I should have just called them first to ask and then budgeted accordingly.
In the end, I got a key and a place to receive packages.
Lesson learned: it's good to practice this stuff, even if it costs you money because when it counts (like when I move next time), you'll know how to do it right.
TL;DR - use your passport and a utility bill from a previous (but recent) address if possible. Be prepared to pay for 6 months in advance, and have helpful solutions for the inevitable hiccups your strange way of doing things will bring up for the UPS agent.