Cold called to sell you printer supplies

Have any other sysadmins gotten a call asking info on what type of copier or printer that you have, then later get a call from a sales person wanting to send you a sample?

So the sale scam goes like this. Some cold call asking about a specific printer/copier/fax unit. They usually ask for the model number, say their thanks and end the call. About a week or so later you get a call from a sales person stating that this is a free sample. They send you the sample with an invoice...

Never during any of the conversation do I state that I want any of their products. Just simple okays and yes's to confirm the address.

I've had 3 of these companies try this. The first was a mistake, as one of my techs used half of the toner. We returned it for half price... The second one I'm trying to get them to mail me a shipping label to return this box. The third, I'm going to yell at them the next time I have some free time.