There is a documented case from 2010 when a block with 92 billion bitcoins was discovered. The bug was found and software was patched within 5 hours and everyone had to "hit the load button" to an earlier blockchain. It was speculated to be malicious. My question is: did anyone try to make transactions with the hacked bitcoins? If not, is it possible the bug was exploited accidentally?
Someone might have a copy if they have a long-running node - they would have had to have upgraded while the hard fork took place to be synchronized today
The transaction was executed by someone who knew of, and wanted to demonstrate the issue. The overflow meant the summed output value was less than the total input amount, despite actually minting billions of bitcoin out of thin air.
It's unlikely the problem would have happened accidentally, the amounts would have been crafted to trigger the bug: two outputs with amounts exceeding the 21 million limit are required to trigger it, so with just one, it would have been rejected.