Checking out the serial number #17876 you provided in the first posting of this thread, there is no entry for this serial number in the Winchester factory records located at the Cody Firearms Museum in Cody, Wyoming as per serial number search - the result which I got back earlier today.
Given this, I think the gun needs a thorough going over, including removal of the fore and butt stocks to see what further information in the form of numbers, symbols, stampings, markings, etc. that can be gleaned from this gun.
One could also compare features found with known 1894s using Madis, Renneberg, and other references to validate authenticity.
It would be interesting to photocopy/scan the RCMP info to see the information entered.