i used to have a USN Mk2 (made from 1095, like a Ka-Bar) that i found backpacking. as we were leaving camp it was off the side of the trail, with the blade stuck in the ground up to the hilt.
no clue how long it had been there. the blade had some rust and pitting, but i pulled the whole knife apart and cleaned the steel up. didn't refinish it with anything and made a custom leather sheath for it.
unfortunately, that blade got stolen several years later, but it never had any serious problems from it's time of neglect.
a modern knife, w3ith scales that can be unbolted instead of stacked leather washers, and a coating on the blade (unless you remove it) ummm... i'm not gonna lose any sleep over it. it's a tool, and i have no problem with tools that show marks from their use. pay a little attention to it and rust should be minimal.
if you're stashing it in your truck or BOB, just check it periodically. BOBs need to be repacked in most cases anyway to change clothes for the season, rotate batteries, rotate food, etc. if it gets a little rust on the edge, BFD, either use it, or sharpen it and it should be fine.
i can't stand some of the low carbon, soft stainless knives that are always shiny, but never hold an edge well.