How to submit sup. material?

greenflower2007

Registered Users (C)
Hey,
I have efiled my I-140 use post office to submit my supplementary materials. and I use delivery confirmation choice. It seems post office can't confirm delivery to a PO address. And my package is going to be reture.
Could anyone tell me which kind of service you use to send your materials?
Thanks a lot!:confused:
 
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