Pretty sure that was meant to be the Golden Fleece, yep.
As for Regina figuring out it was Cora, I’d just guess that if her father went missing, her mother would be the only real suspect. He doesn’t seem like the kinda guy to have personal enemies, or many people close to him who’d care or notice if something happened to him. The only person who’d be affected by his kidnapping would be Regina, and there are few people who would dare to encite the EQ by harming her father.
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