[quote=@malmshodes]
Random question: What happened to the devil fruits of our late captain and doctor?   Did the marines or villagers take them? 
[/quote]

I thought their devil fruits appear somewhere else in the world. They should regrow on those special Devil fruit trees somewhere in the Grand Line.

At least I believe that's how it works. They never really gave THAT much insight on it. Doffy only got Ace's devil fruit because he has 'connections' and Blackbeard managed to get Whitebeard's because he was able to steal it from his dieing body...somehow.

There may be some means to extract someone's devil fruit from a dieing Devil Fruit user's corpse that everyone can do, but I don't think that's been shown yet. We didn't see how Blackbeard did it since he put a curtain on Whitebeard.