it's probably an fax scam.
if you send a paper to some faxnumbers, you will have to pay like 7,5-10 US$, because it's a pay phoneline you send it thrue.
recently in Belgium (a week ago, someone found out such a fax sceme, business offices got a fax messeges, that they had to send there BTW numbers to this faxnumber, to get a tax refund.)