". . . So I didn't know what else to ask."
Understandable.

When submitting an envelope for expertising, its best to steer the result towards the UPSS catalog, even if you don't own one.
With a UPSS # you can always get to the Scott #. The reverse is not true.
Somewhere in the cert request, ask for the full UPSS # of the envelope submitted. The "full" UPSS number will have the watermark as part of it.