Don't go to this Post Office if you have an alternative. I went there because it's near my home and a parcel was being held for me there. I showed the woman behind the counter the delivery confirmation e-mail. She asked me if I had a photo I.D.; I explained I didn't bring it. Instead of saying politely, "I'm sorry, it's Post Office policy that without a photo I.D., we can't release the package," (I would have understood that) she said with an extremely smug and superior attitude, "Well, I can't give it to you, then." She looked like she actually ENJOYED telling me this. I said, "Can you at least please check if you have it?" Again in a smug way she said, "Oh, I have it," again like she was enjoying her petty power over me. It was 4:15, so I walked home super fast, got my wallet and walked back super fast. I really wanted to tell her off, that she could have explained this politely instead of having a smug attitude, but I didn't want her to say something even nastier to me.
Another thing that happened at this P.O. a couple of years ago that was not this bad, but still shows a total lack of intelligence in dealing with customers: I had to return something to a company using the return label they provided. The only box I had was a Priority Mail box, but I obliterated every "Priority Mail" on the box with a thick marker. Showing the parcel to the postal employee (a different one), she pointed to it, looking like she was pointing to the label, and said, "You can't use that." Thinking she meant the label, I said, "But this is what they gave me." She repeated "You can't use that." I explained again that this was the return label provided by the company. FINALLY she said she meant the Priority Mail box. I said I had crossed out all the words "Priority Mail," but she said it didn't matter. It took her so long to explain what she meant. A key element of intelligence is to be able to put oneself in another person's position; one aspect of this is to explain what you mean so they can understand it. This seems like common sense, but it's been said that "Common sense is not common, and it can't be taught."