No, I DIDN'T!!
Anyway, a "milk box" (generally better known as "milk crate"...) is aAh, crate I understood.
Yes, shellac can be decepitively heavy !which has reduced their "useful lifespan!" I pick up full milk boxes (of 78's...capacity c.125, or 62.5 lbs. of shellac) VERY carefully, in case the bottom has "died from overloading!"
Thus endeth the story of "the milk box"...
Steven C. Barr