This guy's hard drive with $500 million in bitcoin is lost at a dump, and local officials won't let him retrieve it

Even with the destruction of a drive, data could be recovered from it. See what has been done with AFM and MFM.

I recall reading of a proven method of recovering erased data from a disk drive using a home-built atomic-force microscope.
http://electron.mit.edu/~gsteele/mirrors/elchem.kaist.ac.kr/jhkwak/TopometrixWeb/datast1.htm

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