TikToker @Bearded_Thrifter made the stunning discovery after he took a punt on a mystery box at a Goodwill Bins outlet.
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The US man filmed the scavenging adventure as he rummaged through charity bins in hope to strike it lucky.
Eventually, he set his sights on a locked pink jewellery box with a Batman sticker on it.
He said: “We went to a Goodwill Bins where you pay for everything by the pound and we found this mystery pink Batman box.
“We gave it a good shake test and it sounded like there was either metal coins or jewellery so we took the $5 gamble because it weighed 3lbs.
“We took it home to break it open to see what was inside.”
The savvy hustler then used a range of tools to break open the box.
In the video, the man then showed viewers how he resorted to a hammer to ply open the seal.
When it released, inside was a treasure trove of jewellery.
He added: “We did find jewellery in there but unfortunately most of it was not really worth anything to my knowledge.
“We also found a key but it didn’t belong to the box.
“This was really fun to do, I didn’t really expect anything valuable to be in here.
“If I ever find a locked box again at Goodwill Bins I am definitely still going to pick it up.”
The video has thousands of views with fellow treasure hunters sharing their enthusiasm for the neat find.
“There can be good money in costume jewellery if it is marked… the thing with the mouth looks really cool,” a TikToker said.
“Lock it up and sell it to the next buyer,” one added.
“The box could have sold for five or more bucks alone if you removed that Batman sticker,” a second commented.
“Costume jewellery is so cute – happy to buy it from you,” another said.
Another man has told how he discovered a mystery box of his old Star Wars toys in the attic and had no idea of the treasure that laid within.