One of my Corydoras fish passed away two weeks ago, and man was it stinky when I fished him out of the tank with my hand.
He did not even get a proper burial. I tossed him over the fence into the garden and figured that the insects would take care of it.
But yesterday I found that my cat had found the sunbleached bones and dragged them out to another part of the garden. There I recovered it.
Here you can see why an Oscar fish does not like to eat a Corydoras. They have nasty spines and they are all bone under the skin.
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I'm sorry for your loss. I have to say that the Cory's skeleton is actually kind of cool. I've always wondered what their skeleton looked like. Again sorry for your loss