Nothing in the item description (below) as you report. "2nd quarter of the 19th century" that would be 1826 to 1850. Not "sort of contemporary" by any stretch
This is the item description:
RIFLE, approximately .45 caliber, figured cherry fullstock with carved cheek rest, rifled octagonal barrel, double set trigger, unmarked lockplate, period ramrod. Second quarter 19th century. 58 1/2" LOA, 42 1/2" barrel.
Provenance: From the collection of Williston and Josephine Cofer, Alexandria, VA.
Condition
Request Condition Report
Very good condition, stock with excellent color, light corrosion to barrel.
Other lots in this auction
But there are other auction platforms which pick up and provide buyers the opportunity to bid. If another platform added information which was not provided by the auction that had the rifle, that seems to be inappropriate. At the same time, if Evans had this information and failed to make it known, that too would seem inappropriate. Whatever the case may be it's a great little rifle and the controversy about contemporary/original only adds to the mystic...and appeal, at least it does at this price. If it sold for many times the price it may not be so appealing. And if it actually "won" a national competition, that's a bonus. HOWEVER I don't view the rifle as the winner, it was the shooter.