The node should know the data to satellite relationship since it is able to display the total data stored/used by each satellite (additionally, each satellite gets its own folder under storage/blobs, you will need to identify which folder goes to which satellite though).
This is likely just a case of ‘not my problem’ that only affects a few people and has therefore been given low developer priority (it is also high risk to low reward, as getting it wrong could wipe legitimate data from many/all satellites while only helping a few less reliable nodes). For completeness sake, it would be nice to have at some point though. StorJ does accept external pull requests if anyone wants to code it themselves (StorJ Contributors License Agreement (CLA))
Reference to finding folder to satellite mapping: