You're right. I think it would be prudent to just go ahead and do a pre-emptive strike and have my fake client send some hypothetical baseball bat wielding Mexicans to your front door, rather than go through the expense of Xeroxing 20 copies of a letter and sending it to each site. Fake Mexicans would be much more cost effective than fake postage.
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Thinking of cracked-out and/or tweaking whores getting their throats and asses brutalized for the next hit makes me hard. --Rear Admiral