Adjust auditing reports to include all the relevant (historical) _db-guids.
OpenEdge® Getting Started: Core Business Services, "Reporting on a single database with multiple GUIDs":
If a reporting requirement is to group related data for a specific database, note that it is possible that a single database GUID (_db-guid) can change over the lifetime of the database, such as following an update to the database passkey, for example. Therefore, data for a single database could, in fact, require reading multiple database GUID values.