James Howells had 7,500 Bitcoin on a hard drive that he bought in 2010. Unfortunately, in 2013 he threw the hard drive in the trash and did not realize what he had done for months. After that, he tried to search the landfill with no luck.

Campbell Simpson purchased 1,400 Bitcoin for $25 in 2010. Unfortunately, he threw out his hard drive after breaking up with his girlfriend, a mistake that at today's value cost him about $70 million.

Stefan Thomas from San Francisco owns 7,002 Bitcoin worth around $346 million. His Bitcoin was stored in a digital wallet for which he lost the password. He thinks he still has the password to his lost Bitcoin on an IronKey-encrypted flash drive. The IronKey flash drive gives you 10 password attempts to decrypt the data. After that, it deletes it...

Brad Yasar has lost a few thousand Bitcoin and spent hundreds of hours trying to recover it. Fortunately, he did not lose all of the Bitcoin he mined back in the day and seems to be doing quite well.