Cannot get balances via RPC calls used in tutorial

[JamesANZ]

In your tutorial here: https://www.shawntabrizi.com/substrate/querying-substrate-storage-via-rpc/ you are able to get a balance back in hex.

I try to reproduce that on my westend node with the westend sudo key as the address and I get back null as seen here: https://gist.github.com/James-Sangalli/840b77de13ef897f6683f47d3d6466f8#file-substrate_get_balances_low_level-js-L35

Thank you for the tutorials btw, they are super helpful!