No certified seller, unfortunately, as stock is limited to individuals who may be DIYers or used to work for Philips.
The only possible way to try and figure out if a chip is fake (restamped) without having it in your possession is to very carefully compare the image of the chip a seller is selling to a confirmed genuine chip, like what you might see on Dutch Audio Classics. Carefully examine the font and other things like the date. There's also things like who the seller is, his country, how he originally obtained the chip etc. You can substantially reduce the chances of getting a fake just by not buying from Asia.
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