DANGEROUS PRODUCT = Moog Ball Joints

I've got new upper and lower ball joints that I purchased on eBay back in 2010 in a front end rebuild kit. Don't know the brand, but they seem to be very good quality. The balls are tight, and I see no plastic anywhere on the joint when I move the ball. Is there a way to determine if they are the type with plastic in them? The uppers are installed in the arms, properly torqued and painted, so I'd rather not go through that again, but I will not use them if I know they are defective. Any way of telling before they go into the car?