From the article
First day: 7 coins for $2600 ($371.43 per coin)
Second day: 25 coins for $9300 ($372.00 per coin)
The article does not mention the number of coins for the third sale. While G&S numbers differ slightly, I have a tough time believing that they would melt valuable coins for bullion or that they would risk their store for a measly $12,000 (well measly to them).
If G&S sold the coins, wouldn't they have a record of that transaction that the authorities could check out? If that is true and there is no record of sale, then the owner may be over estimating the current market for his coins and they were bullion or G&S managed to sell them quickly under the table. I just do not see them throwing valuable coins into the melting bin to cover themselves.