We found another tomato hornworm today- it was incredibly fat and happy. One of the clues (aside from the stripped tomato branches) was the presence of what turns out to be worm poop on the ground.
Also, we had some visitors outside the fence. We were worried about animals being able to make their way through the fence to munch on the veggies. These pet bunnies were outside the fence causing the garden no harm. One of them was even on a leash!