Apparently you can place arbitrary charges on packages whenever you want. I came in 3 days apart to mail 3 certified letters to the credit bureaus. My charges were $3.79 the first time, $3.79 the second time and a whopping $5.62 the third time. Same 3 pages in the same type of envelope and same .60 oz letter. The asian man who waited on me had to adjust my zip code by looking it up in the system since it was incorrect, so I guess he decided to charge me for his 'pain and suffering' in doing so. When I asked him about the discrepancy in pricing since I had mailed this same 3 page letter two other times, he told me that this "letter" was actually a "package". What????!!! A small envelope with three pages is a letter two times but magically becomes a package the third time you mail it. So aggravating! I need to find a different post office. I am trying to talk to a supervisor by phone to get this straightened out, but it seems on top of of all of their wonderful customer service skills at this lovely post office, no one answers the phone here either.