Good you did research on the company you did use and great they practice sanitary guidelines but even so you have contamination regardless due to handling in general. do they test their packaging, how about the shipping containers or their handlers, the trucks the substrate sits on, etc. There are so many ways to contaminate anything that you can't say one thing is better than another. I am just saying you never know. I wouldn't recommend grabbing old newspaper off the ground or from some obviously dirty or questionable location but with reasonable thought I don't see the problem. Who's to say that the guy at the pulp factory cut his hand and blood fell in the vat that was then turned into the sheets you use now. You never know therefore you can't deduce that it is less questionable than the Sunday paper people use. Just my thoughts.