When a new worker at a charity shop found stacks of $100 bills stuffed inside two old sweaters she thought they must be fake.

The store associate at Goodwill Industries then realized they were absolutely real-and the cash totaled $42,000.

Andrea Lessing was in the back sorting clothes and looking for rips or stains when she saw the treasure, and the first thing she thought of was her six-year-old daughter.

"Her birthday is coming up in July, so I can actually give her an amazing birthday party," she told KFOR, a local news station.

But Lessing says she believes in karma, and couldn't imagine keeping the money for herself.

She reported the lost cash, and the shop in Norman, Oklahoma was able to track down the owner, thanks to some identifiable documentation that was bundled with the money inside the donation.

The owners, who had forgotten about the money when they donated the clothing gave Andrea $1,000, which made her break down and cry.

"Since we gave her the reward on Thursday. I spoke to her yesterday, and she is still in shock-and awed by their generosity," Lacey Lett, the Director of Communications at Goodwill Industries of Central Oklahoma, told WS.

Reportedly, it's not just the largest cash find in Oklahoma Goodwill history, it ranks among the top finds for Goodwill internationally-and the reward will help Andrea give her daughter an 'amazing birthday'.

"I made the right decision," Lessing said.

And, her belief that 'if you do something good, then something good will come back to you' turned out to as authentic and true as the currency she uncovered.

WATCH the local news video from KFOR-TV below:

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