Remember that a "no" simply means that we couldn't see yellow dots; it does not prove that there is no forensic watermarking present. (For example, the HP Color LaserJET 8500 series does not include any yellow tracking dots that we can see, but it may still include some kind of forensic marking, since the majority of earlier CLJ models did.)
Remember that a "yes" simply means that we (or another source, as noted) saw yellow dots that appeared anomalous to us. Until we decipher the marking schemes or receive other confirmation, this does not constitute proof that any particular kind of information is represented by these dots. In a very few cases, for example, they might be the result of a poor dithering technique, rather than a forensic mark.
the list of printers that track your printing can be seen at Electronic Frontier Foundation
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