The coins may be genuine, but the slabs could be fake. Might be someone's quick way of trying to make $200 on a $2 coin. Possible, since I agree that they don't look MS-67 to me, either.
No sales of a give serial number doesn't make the number fake. A slab with a given serial number which is still in the possession of the person who originally sent it is would not have a record of a sale. Doesn't make it genuine, either - someone making counterfeit slabs may look for exactly this: a legitimate serial number that has no record of having been sold. Very difficult to trace possession, and harder to detect it being counterfeit.
No sales of a give serial number doesn't make the number fake. A slab with a given serial number which is still in the possession of the person who originally sent it is would not have a record of a sale. Doesn't make it genuine, either - someone making counterfeit slabs may look for exactly this: a legitimate serial number that has no record of having been sold. Very difficult to trace possession, and harder to detect it being counterfeit.























