I would imagine that if you are actually linking stamps.com to your Amazon accounts, then, YES, they could potentially see that the login info is the same. But they cannot link by tracking numbers.
The following is the structure of a Tracking Number:
420 90210 9101 1480 0860 0040 2644 66
Here is what those numbers mean:
420 = Routing application idenifier
90210 = 5 Digit ZIP Code
91 = Tracking application identifier
01 = Service Type Code 148008600 = MAILER ID CODE
04026446 = Sequential Package ID
6 = Check Digit
In this case, the mailer ID code is for Endicia.com. So everyone using Endicia will have these numbers displayed. I'm sure that Endicia has records, but I doubt they would open them to Amazon.
Last edited by jeffweico; 11-08-2010 at 09:52 PM.
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