Then you are lucky. My address from airdrop.ribbit.me is RhcKtPe7CUKAnkKHBjEWr2JouZJGQQuFFn, but if I check on explorer there is 0.00 ribbits. But my wallet file was created on 19.11.2014 so I should be eligible for aidrop.
Please follow these steps
and here the menu -> wallet setting-> Show advanced options
and the magical scan button
Or go to the history in your account and see if your addres send the coins to other addres!
Already did all of these. The problem is, that my airdrop address is empty, because they didn't send me coins.
Pictures below.