This article explains the steps to check serial number in order details on the POS and iSeller web-admin.
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​Step 1: Please click on the Orders menu.

Step 2: Click on one of the order reference that you want to view.

Step 3: Then the serial number description will appear in the order details.
Here is an example display on the iSeller web-admin:

Here is an example display on the POS system: