Yep. If it is the lowest grade possible, it will command a premium.
From a personal point of view, I would be interested in how the TPG determines it is due to genuine wear and not tampered with/environmentally damaged/excessively scratched etc. I suspect the with the exception of corrosion, they will be unable to differentiate, so, for those washers capable of commanding a premium to the cost of slabbing and the intrinsic value of the scrap metal - use human stupidity to your advantage and fill yer boots.