These skins, being rarely found in nature, have long been highly valued. Nonetheless, the claim made by the author of the 1900 quote has been challenged by reputable authorities.
1900  Furs were so numerous that for a flint-lock musket (worth, say, 15s. in England) the Indians were expected to pay a pile of fine furs--such as silver fox-skins--standing as high as the weapon placed with the stock on the ground.
1913  One year, he brought in three of the six silver-fox skins taken that winter in the whole of Canada.
1928  (1953)  Highest price received for one fine half-silver -- $525.00 which is the highest price obtained this year for a silver fox pelt sold in Canada.