Copy machines store everything you copy.

It's been like that ever since the first photocopiers you could use as printers were launched, i.e. when they became digital. Most office copiers double as faxes, scanners and printers and as such, have a small internal memory, usually storing the last 100 documents or so, although there's always an option to say how many it stores. Comes in handy when you pour coffee all over an important document and the copy you made.

I would have thought that anyone with really sensitive documents wouldn't be using a public copier and most people wouldn't copy anything with information on you couldn't get just by doing a few online searches or rooting through their bins. I doubt this "revalation" will lead to the collapse of Western civilization, although it does serve as a good heads up for those of you who didn't know I guess.

Jam it back in, in the dark.