There's no way the lady could have for sure known what dogs got to her female unless she was with her every second that she was outside. I had a little female chow/dane mix in college that I was told was spayed when I adopted her from a local family. She ended up not being, but I didn't find out until every unaltered male dog in the neighborhood came to visit. There was everything from the neighbor's purebred chihuahua to this big doberman/rottweiler/shepherd-looking dog...and everything in between. She ended up having eleven puppies. They ranged in looks from a little 40lbs exact miniature replica of a tan and black German shepherd (we ended up keeping her and everyone thought she was pure GSD), to a big 95lbs doberman replica (kept him too because he attached to me and wouldn't have done well with another family), and everything in between, including a couple that looked like blond labs. Point is, from the puppies, you wouldn't have been able to pick out the mother, much less guessed what the father(s) were.
That being said, your boy looks lab/retriever or lab/aussie, but something else is making his eyes that lighter golden brown. Labs and retrievers have more chocolate brown eyes (usually), not that golden brown.
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I know the people who adopted his two sisters. They look just like him! So I guess the lab genes one in this litter haha