There is no actual harm in adding paper products to the bokashi bin, but we don’t suggest you do this.  As there is no nutrient value to these items, so the bokashi microbes will ignore them.  This means that they will pass through your bokashi bin unchanged. 

Doesn’t paper also introduce a potential for toxic chemicals?  Today many synthetics and toxic chemicals go into the manufacture of paper.  Especially true of newspapers. And magazines which use color inks.