When you are trying to locate whether an item was delivered via certified mail, and you don’t have a green card, here’s a nifty thing that you can do, you can go directly to the USPS website here: https://tools.usps.com/go/TrackConfirmAction!input.action
enter the tracking number on the item which you sent via certifed mail, and the USPS will tell you exactly when the item was delivered according to their records
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