Everytime a file get imported through the Pixyz Plugin for Unity, a "stamp" is added in the form of ImportStamp component attached to the main object.

The purpose of that component is to keep a link between the imported file and its original source file. This component can be access through the Unity API to get information.
This component can be removed safely if unwanted.

Get the ImportedModel

The ImportStamp component inherits from MonoBehaviour. That said, it can be gathered with :

ImportStamp importedModel = gameObject.GetComponent<ImportStamp>();

Get importation information

Please check in the API Documentation details about the ImportedModel class.