I believe that you won't get your BCC anymore.
Coinbase posted an announcement last week saying that they wouldn't support the Bitcoin Cash chain and that you should withdraw your coins out of their wallets if you wanted to get them after the fork. Now that the fork already happened, if you take your coins to an external wallet, you will only receive Bitcoins on the legacy chain. Could you confirm that?
The 0.0171 BTC on the transaction is probably only Coinbase sending the change[1] of the transaction to their same wallet. That's not how the fork works. You would receive the same amount of 0.05 that can be spent on both chains.
[1]
https://en.bitcoin.it/wiki/Change