I would answer this question with "I think I will contact my attourney and seek his advice first." I suspect that would be the end of it, particularly if the agents are trying to bully me in the manner that the link suggested.
Smith, and Wesson, and Me. -H. Callahan
Well waddaya know, one buwwet weft! -E. Fudd
All bad precedents begin as justifiable measures. -J. Caesar