At the time of the Bitcoin Cash fork (Aug 1st, 2017, if I remember correctly) I had all my BTC stored in my Electrum wallet on my Windows laptop. In Oct 2017 I moved all my BTC from Electrum to another wallet on my laptop.

Now I'm want to claim my Bitcoin Cash (BCH).

So I exported all my private keys from my Electrum wallet. I'm mostly a newbie, so I'm thinking that one or more of those Electrum private keys correspond to the BTC I had in my Electrum wallet at the time of the fork.

* How do I determine which of the Electrum private key(s) correspond to the BTC I had in my Electrum wallet at the time of the fork?
* Or, am I on the wrong track and is there some other process for me to claim my BCH?

Thanks,