So I did a dumb thing, at least as far as box-keepers go of which I am one.
I sent my 5D in for servicing of the mirror and, thinking it would be most safe in its original packaging, I did just that
Just in case any of you are as dumb as me, don't send Canon your equipment in the original box--they don't send it back. Oh yes, they package it very well back to you, no fret there. But they don't send you back your box.