Kitten Meows When Digging In Litter Box?

My kitten is just over a week old. He has managed to get into the litter box twice since he’s been with us, and both times I’ve noticed that when he does this, it kind of sounds like someone is meowing. It almost sounds like kittens do it sometimes too. Am I imagining things? Do you think my kitten hears this sound or is it something else entirely?