That's an interesting one. There are a variety of tomato pests, but I'm not sure what does just that kind of damage. Tomato hornwoms are large 3 - 4 " green worms that blend in amazingly well and are difficult to spot. But I think they are mainly leaf eaters and their droppings are hard and black.
Tomato fruitworms (which are the same guys as corn earworms) do enter the fruit and hollow them out. They make a small entry hole near the stem end. But generally then you would find the hollowed out fruit filled with watery fluid, friutworm droppingss and maybe the worms. The fruit that has been attacked like that will quickly rot and drop off, but should still be there on the ground. Look for egg clusters on on the undersides of leaves.
Slugs like to eat tomato fruit andcan hollow them out, but you would probably find some just damaged. And I don't know that they could just disappear all those tomatoes with out leaving more traces. They crawl up from the ground so tend to attack the lowest fruit first. They are only visible at night. If you go out several hours after dark with a flaslight and look closely you should be able to find them.
Lots of macro critters, from birds to squirrels to racoons to deer will eat tomatoes, but they would not leave the round entry hole. Deer just disappear tomato fruit like it was never there. If the ground is soft, you will see their hoofprints. Raccoons also disappear tomatoes, but are messier and may break branches etc. Squirrels most often just take little bites out, but have been known to run off with a whole tomato in their mouth. None of these guys hollow tomatoes out.
Can't suggest what to do until it is figured out who the culprit is. Maybe someone else that's more of a tomato expert will com along with a better answer. Until then, keep checking for eggs, worms, slugs, etc.