Welcome to Numista. You will have to be more specific. Photo, weight, diameter, etc. I pulled this up for now. Perhaps not the Greenbrier you are refering to nor am I certain about this tokens metal content.
Value is whatever you can sell it for which I'm guessing is not much. It's probably a key chain ornament ("RETURN POSTAGE GUARANTEED") for The Greenbrier Hotel https://www.greenbrier.com . Of course if it is silver it would be worth at least melt value but that's unlikely. From the looks of the picture on the token page, it may be silver plated steel. Is it magnetic?