In the case of my Bosch, it was not the case (receipt from a Bosch dealer), but in the general sense you are right.
Spark plugs and Xenon bulbs are favourite fake items still to be found on the 'Bay, being fairly high price consumables.
It should be obvious of course, that if you see boxed PTR6F13 or ITR6F13 NGK sparkers at 4 for £8 that they can't be genuine. That's about what you would pay for one, but for some reason greed takes over from reason, and people can't resist a "bargain".
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