I can think of four times the fake seer gambit has been pulled.
Oldest I can remember was over a year ago I believe. SPLIT was a wolf who contacted Nautilu to out GUG, who was the seer (or perhaps it was Dutchguy he was supposed to out, and he contacted GUG to out for him). GUG had scanned two wolves, but rather than out either of them, instead "outed" Nautilu as a wolf. Village lynched Nautilu, saw he was a villager, and then lynched GUG. Wolf parity. A rare instance where the village should have lynched the seer, as I suggested at the time before being hunted.
Second was Wagonlitz's famous double seer with 50% gambit. Which predictably blew up in his face.
Third was my effort to contact Rovsea and get him to out a "wolf". Unfortunately the actual seer got lynched, revealing myself as a liar. I somehow convinced Rovsea I was a villager pulling a stunt to avoid being hunted, and we ate him that night.
Fourth was rather recently when Marty contacted Spokcyt, the seer, for contact. Which obviously ended poorly for both involved.
So overall not a very successful record. The only two times it didn't blow up in the face of the wolf who tried it was due to the village, or villager as the case may be, being tricked far easier than they should've been.