We've fleet weights and for each individual I can check if there's any change to Dry Operating Weight or Index.
To put in perspective; if 1 out of 10 of our 737's has a correction of +660 kg to DOW, but the others has 0 kg. Do you really believe that's true? Or is it just a case that most fit within the margin of fleet weights, one didn't.
I think there's bigger fish to fry out there. Such as standard weights for pax and luggage. Unlike the DOW/DOI, those discrepancies I cannot find in my manual.
Measure with a ruler, cut with an axe.