Had a casascius silver coin and opened it when BTC spiked to $1100 couple months back. Trying to send some funds to the coin but now cannot seem to find the address. When I type in the first bits on blockchain.info it says firstbits not found. I know the first bits I've typed in are correct, my vision is perfect.

Here is the firstbits which are public on the back of the coin: 1Ag1qstB.

If anyone can find my address for this coin I would much appreciate it.