At this point, I realized that logic and reason were pointless and simply re-mailed the envelope and left.
AMEN! USPS is USELESS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I have mailed envelopes with checks for some payment inside and after a few days the envelope came back with payment due for the stamps stamped all over it, because their stupid machine ripped the stamp off. I have to address another envelope and put another stamp on it.