Lesson learned...

It that head was sent out like that, I
would be checking more than out than just the decks before I took it back. Was someone not paying attention when the head head came out of the decking mill or was it pushed across a shelf covered in gravel and metal shavings?

I don't know what happened. I just know it didn't happen sitting in its box on my bench at home. I'll try and stop in this week and talk with the owner. It's been so long that I really have no recourse. There's a good chance the only time he touched them was when I brought them in and picked them up. No machining was done on them.