I-140 E-filed EB1-EA: usps express mail can not deliver the supporting documents

Does anyone know about the timeframe, on receiving the receipt for I140 and I-485 (including I-765) filed concurrently at Nebraska. Also, do they issue the receipts simulateneously or at different times on EB1 cases. How long does the approval for EAD takes.

Tx
 
I did stop by Fed Express and the service person told me fedex cannot deliver my supporting documnet (i140 efiling) to PO box, Texas service center.

Did any one send through Fed Ex?
If waht address used?
Or USPS express mail?
 
USPS express mail would deliver your package. For some reason, on the first try they leave a message in the P.O. Box. However, next day they would go an deliver the package at the USCIS office.
 
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