Yes, the PO Box address was the correct place to send your RFE response. USCIS does not always update the online case status system automatically so it will likely be within the next week or two that you see a change of status noting that your RFE Response was received.
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1. Yes, that was OK, you did all right.
2. I wouldn't "hold my breath" on this one, as the USCIS online status site is notorious for not being updated on "real time". I would say a month or even more.
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You have to mail the information requested to the address they ask o mail it to. Once they receive the information and process it, the status will be changed online if changed in their system.
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