Knew somebody who emigrated to US from UK and the system case had to
go in the hold - packaged it well but during the flight the CPU HSF
was ripped from the CPU socket and trashed the motherboard / RAM due
to rolling around inside the case :-( Luckily had the sense to carry
the HD in personal baggage so not a total disaster !!

Moral of story - moving PC's needs care, and things can work loose