Hi
Although, one may have some success by shipping in
a cardboard box only ( mine was trashed ), it should
be bolted to at least a piece of plywood. If this
is put into a box, proper strain relief should be done
where plywood edge meets the box. This is so that the
plywood doesn't just poke through the box.
These units are too heavy to be in a cardboard box
alone.
Dwight