Check this list to see if you have any treasures. (a list of the most expensive NES games)

After reading about a rare NES game that brought in $13,000 on ebay last month, Kansas native "Dave" decided to dig in his basement and see if any

To his astonishment, not only did he find a copy of the same game that just fetched over $13,000 on eBay -- highly sought-after collector's item Stadium Events -- it was in perfect condition, right down to the original shrinkwrapping and Richard Gordman pricetag. (A mere $29.99, if you're wondering.)

"Now I’m not much of a collector, but I know that having a factory seal is good," he said.

But he's only just now finding out quite how good.

As it turns out, the game's unopened condition makes Dave's copy of Stadium Events three times more valuable: he sold it on auction site eBay for a breathtaking $41,300. It's thought to be one of only two shrinkwrapped copies of the game still in existence.

Why had he never unwrapped it? He couldn’t see the point. Stadium Events needed a special floor mat controller to play, and Dave couldn't find one.

"The pads weren't available when we went to purchase it," he said. "We never got around to returning the game...lucky us!"

"Lucky us" indeed. Nintendo bought the rights to the floor mat controller in 1988, and recalled the few copies of Stadium Events that reached retailers. Fewer than 200 games are thought to have escaped destruction, and fewer than 20 are thought to still exist. Dave's procrastination earned him a $41,270 profit, which he and his wife plan to invest.

"After taxes and tithing, the rest of our part will be going to a retirement account that has been decimated by the dot-com bomb, 9/11, and the recent market problems. Not very sexy, but needed." He's also going to auction off the rest of his Nintendo paraphernalia.

If that's inspired you to comb your basement, attic, or other dark corners for valuable 1980s video game memorabilia, don't underestimate the demand for even the most everyday of Nintendo collectibles -- this box of Nintendo breakfast cereal sold on eBay last week for over $200. And if you think you've happened on a valuable game, check it against the list here to avoid disappointment.

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