Well, I believe the unveiling of the dagger drawing was not so much to let him know his dad is in SB, but to convince him to leave Emma. The post card that would tell him the curse was broked was promised so Neil/Bae would be able to come to Storybrooke to be with his true love, Emma. After all, the reason Neil/Bae turned Emma in and “abandoned” her was to allow her to proceed to be the “savior” and break the curse his father enacted, which he would agree would be a greater good. I don’t believe Neil/Bae is interested in finding his father, he just wants to be with Emma.
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Don't grow up. It's a trap.