The boy, named Daniel, sent the stretchy man toy back to Whitelee Windfarm visitor centre along with a letter explaining the mix-up.
Scottish Power, which runs the facility on Eaglesham Moor in East Renfrewshire, now wants Daniel to get in touch.
The firm said it wanted to send him a "gesture of thanks" for his honesty by returning the toy worth 10 pence (Rs 8.66).
The boy wrote: "Dear sir/madam, I was in the shop and picked up the enclosed thinking that my mum had paid for it. Unfortunately, she had not so I am returning the item."
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"I'd certainly like to praise this very honest young boy for admitting his mistake, and for his sincerity in his actions.
"It's certainly heart-warming to think that someone would go to such lengths to return an item of very small value to us."
"Unfortunately we don't have Daniel's return address to send him back our own gesture of thanks, but I do hope he gets touch or visits us again with his mum," Parkinson added.
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