I dont think you can stop the shipment once its on its way....you never know though, you can ask them.
I hope that you get your trade and everything works out, but when a situation seems bad, it usually is.
Im sure that if you get ahold of him, then the usual "standard" excuses will start:
"Oh, my email was down" - Thats always a popular excuse
"Oh, I addressed it wrong" - Another classic
"Fell off the roof and hurt myself" - Not a common one, but has been used
"My wife was supposed to mail it" - Have not seen that one in a while, but used to be fairly common
Good luck to you