Remember James Howells?
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This Briton became famous after he accidentally lost a hard drive containing 8,000 bitcoins in the trash in 2013, when one bitcoin was worth just $170.
Today, the coins are worth about $800 million (3 billion riyals).
In an interview with the BBC, he said he spent 11 years searching for them in landfills, and is now offering a 25% reward of his fortune to any entity or institution that finds them.