The wallet came with a pink sticky note from an anonymous finder begging forgiveness.
"Hi. I cleared out my drawers and found this wallet," it read. "Have I sent it to the right person? My son came home with it and I misplaced it in a drawer, too many years ago. Hope you forgive me:)".
"That's the reason it was so funny," Gro Aske told Ostlands Posten. "I had not seen this it since I lost it in the Horoskopet nightclub many years ago. I reported it at the time, but thought it was gone forever."
She estimates it must have been close to ten years since she lost it.
The story brings a new twist to the trust experiment where 10 wallets were randomly "lost" by Readers Digest in 20 world cities to test the honesty of the population.
Famously, all ten of the Oslo wallets were returned, compared to seven in Stockholm, and just two in Lausanne.
No cash had been stolen and all of Aske's cards and photos were untouched.
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"I found my old bank card from Larvik Bank, which was green at that time, and many old, funny pictures. At that time it was popular to carry around pictures in your wallet. We looked so young and fresh, with many weird hairstyles," she told the paper.
"Of course I forgive this person," she added. "It was probably their son that found it and brought it home, only for them to forget it."