RFE return address? (California Service Center)

Im ready to send my rfe documents..
the envelope they provided was too small so I used bigger envelope

I am confused which address do I sent to?
I will send as Express mail /overnight
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The return address on the RFE envelope says:

U.S. Department of Homeland Security
P.O. Box 30111-30115
Laguna Niguel, CA 92607-0111
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-the small envelope inside the RFE that was mailed is postmarked:

Department of Homeland Security
U.S. Citizenship and Immigration Services
California Service Center
P.O. Box 10590
Laguna Niguel, CA 92607-0590

Attn: RFE
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California Service Center
2nd Floor
24000 Avila Road, Laguna Niguel, CA 92607-0111
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which address do I send to?
If I have to sent it to PO box ....
I have to waive the signature option for express mail?

Thank you

send it to this one:

Department of Homeland Security
U.S. Citizenship and Immigration Services
California Service Center
P.O. Box 10590
Laguna Niguel, CA 92607-0590

Attn: RFE


thats where i sent my RFE, and the PO Box thing doesnt matter, i sent mine in a normal white envelope with 2 stamps and they got it

where i sent my RFE, and the PO Box thing doesnt matter, i sent mine in a normal white envelope with 2 stamps and they got it


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