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I get loads of cardboard from whitegoods stores and make up my own boxes. I've shipped to the US and all over europe from here (ireland) and never had a problem.
as for stores with compactors, they'll crush most trash, but heavy cardboad just laught in the face of compaction!!
Good thing you still had that old box! For what it's worth, my guitar company (Halo) uses U-LINE FOL (Full Overlap) Guitar Shipping Cartons for shipments in the USA and worldwide. They're affordable, strong, and the right dimensions!