Query seed neuron ids?

What is the best way to query the neuron ids held by a seed account? I am using an air-gapped computer and stuck after this step: docs/seed-donations.adoc at master · dfinity/docs · GitHub. It doesn’t look like there is any way to dissolve a neuron without knowing its id in advance.

I do have the resulting hex string from the dfx canister --network=https://ic0.app --no-wallet send message.json command, but I am not able to decode it with didc. Any help would be much appreciated!