»You can feed it the complete paperworks of a transaction, complete with binders and in critical cases, including the customer.«
The NSA version looks like this:
The back end is an incinerator, to burn the shreds and bits coming out of the mills. That means, the documents, the binders, the desk and the people at the desk are shredded and consumed by fire. In the end all that comes out is a small and handy pile of ash.
Less elegant, but probably quite effective.