Mike,
I assumed from the wording:
"1942-03-09. AMERICAN "LEASE-LEND" EQUIPMENT. THE "WHITE" SCOUT CAR IS USE AS AN AMBULANCE."
used on this photo, and this one taken on the same day:
http://cas.awm.gov.au/item/011721
"1942-03-09. AMERICAN LEASE-LEND EQUIPMENT. TESTING GROUND. EACH VEHICLE IS GIVEN RIGID TESTS TO ENSURE NOTHING WILL GO WRONG ON THE FIELD OF BATTLE. A GUN TRACTOR IS SHOWN HERE AS IT GOES BOUNCING ACROSS THE GROUND.
that perhaps the Ambo. was a demonstration model, not neccessarily in use.
By the way, that last photo is a cracker!
Nothing ever seems to be cut and dried with the AWM Photo collection.
Rich.