I send mine from Fl to my accountant in Michigan, went well until last year. I took the packet to the post office and sent it certified mail. The clerk hit a wrong digit in the zip for the stick on bar code.
The package looped from Lubbock, Texas to Grand Rapids, MI for almost two months. The systems are totally automated, and they couldn't put their hands on it. The package would get to MI, the machine would read the bar code and send it back to Texas. In Texas the machine picked up the written address and kick it back to Mi.
I felt helpless, as did the postal employees tring to get it kicked out of the loop. I could watch the tracking as it happened.
I had to file an extension, as it was May before it got there.
From now on, I'll file the extension, and hand it to the accountant. It would have been a real pain to try and get all the records back if it would not have made it.
Its real easy to file an extension on line....