Ah, this one kills me. It's a happy story in a sense - honest urban explorer returns money to family. But the photos - the photos! They protect the identity of the family in the article, but I can see from the photos that they are Slavic, and given that the money was American and Canadian, I'm guessing the vicinity of Detroit. And as someone with Slavic cousins who were drawn to Detroit for the auto industry, back when it was the Silicon Valley of its time, I could all too easily see this happening to my own family. That said, the place is a time capsule, the family now knows (and has presumably taken at least the photos home), and there's the kindness of strangers aspect. So all in all, a happy tale, but still tugging at the heart, you know?
Here's MESSYNESSYchic, where I first read about this:
And here's FREAKTOGRAPHY, the person who explored and photographed the house (photos for sale, if you're interested):