I have had several cards graded by PSA over the years, whose cert numbers came back as unknown when entered into their site's verification feature. When this happened, they had me send the cards back and they then logged the certs into their database. This may very well be the case here, time will tell. But it's worth noting that an unknown cert is by no means proof positive a card/slab is fake. Often times it's fine but they didn't put the cert into the system after grading or bumping.
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