Signing models for internal use?

When exporting models from a developers database and importing them into a test server, is signing models usefull? Or is it only usefull when exporting models into customer databases to provide them with prove there wasn’t any tampering with the models? Furthermore, does there remain any evidence inside the database that the model was signed during import. Because when importing a signed model, and looking at a model overview, the models still don’t show up as signed. This can be modified with the axutil manifest command. Does anyone has further comments on this?