willshak fired this volley in news:k08g16$gps$1 @dont-email.me:
Think about it. IF it was used to hold a beam, they'd want to close it up entirely during shipment to keep trash, vermin, etc., out.
At the receiving end, they'd remove the top and the doors, then insert the lift spike in through the ends (doors). They have to be there, because the center of the 'spool' (beam) is below the top of the crate.
Insert spike, lift beam out of the box. Re-install doors, re-install top, ship empty back to the mill again. There, they remove the top and doors, lift a beam back into the box, remove spike, reinstall doors and lid, then ship.
LLoyd