Received: Postcard on February 23rd, 2018
Address (in database) used:
Carrie Underwood
The Hq, LLC
1616 17th Ave S
Nashville, TN 37212-2813
USA
The postcard is basically a pre-print, with a picture or her on front and fake signature on back. Of course, it's your typical sorry-I-won't/can't-sign-but-thanks-for-your-support note (and though it doesn't say she doesn't sign, that's basically what it's communicating, with how she didn't sign).
This is a surprise! I did not expect to receive anything back from her.

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