Zigner
Senior Member, Non-Attorney
In New York, a notary isn't required to stamp or seal a document. They can simply write the appropriate language below their signature.Photoshop cannot mimic a raised notary seal at all. I don't see it working to mimic a non-raised one either the way that the ink prints. After all, a notary seal is nothing like a letterhead or even a photograph.
In my state (California), notaries must use photographically (i.e. photocopy) reproducible stamps.
ETA: The OP can get enough information to verify if the notary notarized the document by starting at the link I provided.