I think you are grasping at straws. There were no deterministic wallets back in 2010. Electrum was released in late 2011. Besides you don't have the words so what difference does it make?
If you want to pursue this attempt to recover the files on the USB drive. Then you have something substantial to work with.
Was bitcoin the first to use a seed phrase design.
I've no idea whether Bitcoin was the first cryptocurrency for which there was a wallet that supported a system of seed-phrases.
Not all Bitcoin wallets support seed-phrases. Notably the reference implementation Bitcoin- Core does not yet support seed phrases.
BIP39 - Mnemonic code for generating ...