btw, McIntosh will sell you a set of OEM double boxes for their units, mail empty to you, then you can safely ship the heavy beasts and the buyer gets OEM boxes, a nice selling inducement.
I've been to the factory in Binghamton (amazing, huge), had them check my MC2250 and C28 prior to me selling/shipping them on ebay. they mistakenly tossed my old dirty boxes. They made new boxes while I waited.
Other makers might do this also.