The prizes you can get from Treasure Detector magic changed on March 1st, so the wiki needs to be updated with the new prizes.
As of now, I have added the Jolly Roger pin to the list of prizes (found this morning), but haven't gotten around to adding:
Pirate Player Piano Color Green
Pirate Hat
I also got 2000 credits, but that was the same prize before. I think there are more prizes in the pins as well besides the ones I have mentioned. For now, this is all I have. If anyone could list what other Pirate-themed prizes you got, that would be great.