recycling? According to our copier salesman, our Kyocera toner cartridges can just be recycled in the regular recycling since they don't have any metal parts. Even though they are empty there is always a little bit of toner left in the cartridge, and he said that this isn't a big deal because toner is just ground up plastic. Is this true? Can I really just recycle the cartridges in our co-mingled recycling dumpster?