http://www.team.net/www/morgan/tech/whotools.html
This is interesting...
I found a Craftsman 1/2" socket set that I bought in 1992 or so that had a NAPA 3in extension in. It was factory sealed by looks. When I asked about it, they said they would be glad to exchange it. It looked identical, so I kept it.
If anyone cares. I just buy no less than Craftsman, I got tired of getting hurt on crap tools....