Not sure why he didnt have them add the surcharge, but....
There may have been a problem in the amount of money (for postage) that was selected at the USPS. This may result in: 1. Your package returning to me for insufficient postage, 2. the USPS charging you for postage due, and/or 3. they let it go through without any problems. I wanted you to be aware of this problem - the person at the USPS charged for First-Class letter and not Large Envelope (a difference of about $0.26), due to the 1/4" thickness rule (new postage rules). Please let me know if you are charged extra postage, and I will ensure the difference is taken care of. If the item gets sent back to me, please allow time for me to resend. Overall, this problem was beyond my control, and I will do everything in my power to make amends. I am sorry for any inconvenience this may have caused. Thanks again for your purchase.