Ex mount, polished and flat for a common issue and an indifferent date will only ever be worth melt value. If you can get to within a couple percent of spot from a bullion dealer (or coin dealer), then I would go that route. ebay with an accurate description will likely only make that before fees & shipping costs.
 
	I would wait for the refund before selling as it is the physical evidence.  Get the case opened if you haven't already done so.