Not necessarily fake, unless they are marked NXP on their packages.
Most likely they are just old stock Philips components, sold as "NXP". Just like you can fin myriads of eBay sales on old HP instrumentation labeled as "Agilent". It's just to attract "young" buyers who wouldn't happen to know the original manufacturer's name (or know they were making this kind of product), a very frequent practice on those sites. Many young engineers may not even know that Philips used to make ICs. I hate this kind of deceptive practices, but they are quite common.
Now if the chips are indeed marked "NXP" on their packages, they are fake, but I'd be willing to think they are just in the above case.