I inspect the contents from time to time.

The little birds are intact, with unrumpled feathers, free from smell, dry and light, like mummies.

They have become not decomposed, but mummified.
I expected to see them putrefying, running into sanies, like corpses left to rot in the open air.

On the contrary, the birds have dried and hardened, without undergoing any change.

What did they want for their putrefaction?
simply the intervention of the Fly.