Anarcoins - Goxxed For The Last Time! (A commiserative coin) (.999 Silver)
From Coin Community Wiki
|Weight||28.41 Grams, 1.002 ounces, 0.914 Troy Ounces|
They were announced in this Bitcointalk thread.
Not all coins were sold with a Certificate of Authenticity. The first 20 coins were not laser engraved their serial numbers.