LBlack14 When you file a complaint on the website, it is directed to the P.O. that handled the package, and they are the ones that will respond. Sometimes, that complaint will be forwarded to the last known hub/P.O. that accepted the package. I got immediate responses to let me know I would get an answer in 24 hrs. or less. ALL responses were signed by the Postmaster, from the appropriate service area.
The only problem I've had was with a M.O. that was sent to me. We both filed complaints on both ends, but to no avail. After several weeks, and the $$ matter taken care of another way, it did finally show up, 6 weeks or so later.
I do not advise sending envelopes during these times. Too many boxes to get tangled up in.