It’s easy to get pressured into thinking it’s your responsibility. There’s also the risk that an unhappy company will make a non-copyleft clone of your project, pump resources into it until it’s what everyone uses by default, and then add proprietary extensions so no one uses the open-source version anymore, which, if you believe in the ideals of Free Software, is a bad thing.
The article says they were claimed to be found in his car by a then-girlfriend who took $10,000 reward money to testify, not that they were found by law enforcement and collected as evidence and checked against a list of things that were known to have been stolen. It’s plausible that nothing was found and the whole story was made up for cash, or that it was just some stuff he’d bought at a yard sale that was misidentified, or something he’d stolen from somewhere else. Someone saying someone had junk in their car isn’t strong evidence of anything.