In general the rolling mills call it a "cobble" when a whole or partial bit of steel escapes the rolling mill. Lots of exciting videos.
I remember years ago hearing about how the US mint misprinted over a million and had to destroy it (and on the Colbert Report, he joked about how them destroy it by burning it in front of poor people). We were talking about it at a party and someone asked, "surely they noticed? Why didn't they shut it down?" An engineer in our group said, "Have you ever been in a factory? It's so fast!" He worked in a toothpaste tube factory where you'd see hundreds of tubes come out every minute. If something went wrong, you'd have to wait for the whole pipeline to clear. Fab shops in China are even more insane.
I wonder if the mill would just sell those sheets at a reduced price as low grade/for non-visible construction or if they re-melt them down and run them again.
They weren't wildly misaligned, but far enough from true that we had to wash them off and run them through the line again. Took a couple of us most of an afternoon to sort it out.
I worked at a bar during university during a time where the popular beer sale would be "28 bottles for the price of 24". The bar owner would send me and a few guys in a truck to a beer store in another town to buy as many cases as the truck could handle. This was illegal as we would sell it at the licensed bar (all liquor was supposed to be purchased with the license, for which the sale wasn't applicable too). So the owner was willing to risk legal action for 4 free beers (x50 cases or whatever).
The point is... restaurant owners sometimes go to great lengths to save a few dollars.