I recently purchased a card that apparently was shipped using this system. I didn't understand what the ESU tracking number was when I saw it. The tracking info shows a little differently than something shipped with regular USPS tracking. For instance, it doesn't show arrival at my local post office. Instead, the Out for Delivery status shows from the sorting facility that is usually the last stop before my local PO. However, the status in the tracking does show Delivered on the date and time my mail was delivered that day and I received the card.
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