gravity32,
How can the altitude data be "unadjusted" if it's units are feet?
A raw or unadjusted signal would be measured in pressure units and not feet.
The deviations to the data at transition levels or altimeter adjustments are very small in relation to the overall signal and therefore not easily discerned.
I would say that the data is FDR QNH corrected altitude as per the investigation I linked to earlier.