Company I used to work for too delivery of a C152 imported from the USA. We were assured that it had long range tanks. Found out it did not on a dual instructional flight when it got very very quiet.
Imported into where?
If it was Australia then I doubt very much that it was ferried therefore the tanks would have been emptied prior to shipping.
Surely a fuel gauge calibration would have been required for an Australia C of A.
How could you not know what it had?