Nils was famed in the goldfields of Western Australia as the finder of the gold nugget named "Little Hero", which was taken into Roebourne from Shaw Falls, Nullagine, on 25 July 1890, by five men, John Williams, John Doyle, John Pryde Charles Capner and Nils Bengtson. The gold weighed 460 ounces, including two big nuggets, one weighing 333 oz. 8dwt. Bengtson was apparently the one who unearthed the nugget.