Had the seizure been adjudicated? In most instances, with the IRS, the answer is "No". 

 "America’s Founders understood clearly that private property is the foundation not only of prosperity but of freedom itself. Thus, through the common law, state law, and the Constitution they protected property rights—the rights of people to freely acquire, use, and dispose of property. With the growth of modern government, however, those rights have been seriously compromised."  Cato

It's not just the IRS:
http://www.pbs.org/newshour/bb/nation-july-dec13-assets_08-19/

As .gov spends society into economic ruin, these things will begin to happen more frequently.  It most often begins with burdensome taxation.