other than receiving "burned" media, there is no easy way to tell.
frankly, there is little margin for profit on anything besides a new release
I have a few, a precious few, pre-release "burned" media albums, but those are "collector items"
that I'd be real suspicious of on buying any auction venue....
"previously owned" music CDs on ebay, half.com or amazon is pretty safe presuming the seller isn't in China, Russia, the Ukraine, etc