if you can shatter the disks well enough, they will be unrecoverable. offer him a cert of distruction and set them aside until you have them all together and can shred them and mix them together in one lot.
you can photograph the process of destruction by taking staged photos of each step in the process.
step one, serial numbers
step two, covers removed
step three platters pulled
step 4 platters drilled
etc...
and send that along with the CoD for signature
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