in my opinion it is impossible to find Satoshi's bitcoin storage address because in addition to its very secret identity, looking for a bitcoin address Satoshi is a useless thing because if we find it we won't get any profit
Well, if we will be talking about Addresses, the closest possible address Satoshi use was the address others call the "Genesis Address", wherein it is the first ever Bitcoin address and it is said to be the home of the first Bitcoins being mined. From that, we can actually say that it is one of Satoshi's wallet since as far as I know, he is the first one to mine Bitcoin.