Help locating Contract Document Unique ID for REST API use

We are interested in using Contract REST APIs for downloading Contract Documents, like this GET method > REST API for Sales and Fusion Service in Oracle Fusion Cloud Customer Experience - Get a contract document

The API has a template parameter for ContractDocumentsUniqID and we found some example payloads that suggest this value is a 76-character, alpha-numeric (seemingly hexadecimal) ID field.

/fscmRestApi/resources/11.13.18.05/contracts/{contractsUniqID}/child/ContractDocuments/{ContractDocumentsUniqID}

I cannot find such an ID in table FND_ATTACHED_DOCUMENTS, FND_DOCUMENTS, etc.

Where can we query these Document ID values in bulk to use in the API calls?