If the ECU is locked then they can't read the map so couldn't say who's software it is. Likely candidates are Revo, APR or GIAC. I had the same issue with my Leon, turns out I had Revo Stage 1 software on there, but set back to the 'standard performance'. Revo should be able to tell you if you give them your VIN, not sure what kind of records/details anyone else would need