Nice score Paul,
I think you know enough now to find your assumption to be accurate.

Correct colouring
Strong wear evidence of flaps being fitted
Badge, cap and groove cover correct
Remnants of skirt mount bolts
No height adjust slit
And most importantly, correct serial, both top and bottom for early auto.
About a thousand or so of the earliest variant with axle nips, but very early nonetheless.
Regardless of its missing bits, its still a desirable part of any collection, and very worthy of saving.
Great Score! Hope the price was good, and glad the vulture wreckers didnt out bid you to part it out, as historically any auto is worth preserving, especially in the hope of one day finding the missing pieces.