Something smells - and it isn't the cheese

A couple of days ago there was this news item (http://www.stuff.co.nz/business/5669488/Fonterra-extends-cheese-recall) about the recall of some of Mainland's cheeses. The reason was that a piece of metal was found in one of the packages. Another one of those examples that there are different issues depending on the size of a system. A small dairy factory won't have the same problems as a huge dairy factory has and won't have the challenging task to recall tons of cheese in case something went wrong. But our government still thinks the same requirements should apply to multi-ton cheese production and a small dairy which produces 50 kg of cheese a week.

But this to me is not the most interesting information from the article. This here is:

On further investigation it had found that a small amount of the relevant cheese was blended and processed into flavoured individually wrapped slices [...]

Isn't it interesting that companies like Mainland want you to believe their cheese is made by artisan cheese makers, matured a long time while the cheese makers go fishing, ripened to perfection before it hits the shelves in your local supermarket? So tell me how can it then be that the from the recall affected cheese ended up in the following products:

Mainland Tasty Block 500g, Mainland Tasty Block 700g, Mainland Tasty Block 1kg and Mainland Cracked Pepper Processed Slices 250g

Purely from a technical point of view, how can this be possible?