My memory wants to place the Carvallain mentioning it around the time Tataru is blackmailing him. When there's talk about how you're supposed to report everything you get from a ship you pirated to the Yellow Jackets, but on occasion when it comes to having pirated Garlean ships someone might not notice you not mentioning a whole engine. Speaking of wooden ships are we all assuming that they are all late 1700s if not mid 1800 wooden ships? As early wooden ship models would have needed to take longer.