You can auction it off in this section with a reserve price you have in mind. Be sure to use a trusted escrow though when selling.

Here's an ongoing auction for one of the Casascius coins from the same year:
https://bitcointalk.org/index.php?topic=5307335.0

Perhaps post a picture of the front/back of the coin with your username as a proof that you indeed have possession of the coin and it's in mint condition.