your slab
Look up a slab by its cert
Every price tool answers what a card is worth. This answers what your card has done — the same number, the same piece of plastic, wherever it has been — and whether the grade paid for the plastic.
Why a cert and not a card name
Two PSA 10s of the same card are not interchangeable objects. One may have sat in a vault for a year while the other was relisted three times at falling prices. The cert is the only public number that tells them apart, and it is printed on the label you are holding.
Two fees, two verdicts
A slab is worth a raw copy plus whatever the grade adds. Grading cost about $25 when most slabs were made and about $80 today, so the same slab can have paid for itself at the fee you gave and not at the fee you would pay now. Both are shown; the gap between them is the point.
If nothing comes back
That means we hold no record of that slab, not that it is unknown to the graders. Certs are only recorded for cards whose full metadata has been re-read, which is a growing subset of what is indexed. Try the card search instead for what the card is worth generally.