Looking for lost address with SJCX


I’m new to counterwallet but I’m helping a friend with his since I have the python knowledge he is looking for.

He tells me he had SJCX in an address that has since disappeared from his counterwallet (post-May 14). I’m using CounterWalletHelper.py and blockchain.info API to search his addresses and query the final_balance.

Things i’m wondering:
is “final_balance” in blockchain / blockexplorer for BTC only?
I’ve downloaded 10k addresses and all balances show 0. Is it likely that his address is not in those first 10k?
if i were to query the transactions, would that show an SJCX transaction?
Is there a better way to do this?