Snails and disappearing dead fish

Lately, I've been allowing ramshorn snails to live in a 10 gallon
planted tank - they seem to do more good than harm. I've also got
Amano shrimp and Malaysian trumpet snails in the tank.

Now a guppy has gone missing. I cleaned the tank and couldn't find a
trace of him. There isn't any smell, no corpse, and the water tests
fine. Fancy guppies with huge tails can't jump and I don't have cats.
Can shrimp and snails completely eat a dead guppy and plants absorb any
water quality problems? Should I keep searching for a corpse?