yeah this used to happen to me when I would sell fullsized pc's …
Perfect boxing on the outside just like yours.
Then when some one would drop the box 5 to 8 feet the shock would tear the gpus loose , tear the heat sink off the cpu maybe bend the psu
out of its brackets.
I found I needed to use a few rolls of pink bubble wrap inside the case. Typically an extra 10 dollars a pc. Just for the bubble wrap to
pack the gpu's the cpu and the psu so that they could not tear loose.
I also had to pull the motherboards cable loose so no one would start the machines filled with the bubble wrap.
(you would think a guy buying a 2k pc would know better)
needless to say I stopped selling the bigger pieces of gear.