I've got 400 square feet of 3 inch unfinished oak to install. The flooring came in 50 square foot boxes. When I put sample pieces together (just to test -not to actually nail down yet) each box seems to fit perfectly together with no height differences. When I mix boxes, pieces seem to be slightly different heights. Should I just lay each box one at a time (the colors seem fine if I do this) and would this possibly save me from a lot of sanding? The floor almost looks good enough that if I did this I could get by with a hand sander..............any good reason not to do it this way? thanks