Filtering WMS API Inventory by Lock Codes (Including Null Values)

We are using the WMS API in Postman to GET inventory by allocation zones. In the output, we need to display the "current quantity" of items only for specific lock codes.
Include: Inventory with lock codes such as "CC" or Null/Blank.

Exclude: Inventory with lock codes like "DAMAGED" or "SCRAP".

For lock code "CC", we can filter using its lock code ID "XYZ". However, for Null/Blank lock codes, there is no lock code ID available to apply a filter in the API.
Is there a solution or recommended approach to retrieve inventory quantities that include Null/Blank lock codes along with "CC", while excluding unwanted lock codes?