Hey Scott,
I weighed the packages very exactly in my posting mentioned above. And yes, the weights given by Onefinity are not exact, but my weights of the packages are quite exact. Sorry if this does not satisfy you. If you consider how heavy the X, Y and Z axes are, then I think the weight of the cardboard boxes is very neglectable. And I gave you a list of the additional accessories above that were in the two Y packages in this posting of mine. I think I would be able to plan whatever you plan with these weights. Or do I miss something?
I was able to put each of the packages vertically on a balance for persons. What kind of balance do you expect the manufacturer to have to weigh an assembled machine, which is not transportable? A truck balance would maybe not be precise enough, and how would you transport to machine to it?