Doing the math, assuming he’s got an high-but approximately human stomach capacity of ~4L, and using the dimensions of the 500 count Amazon basics cotton swab box (approximately 84 cubic inches, or 1400ml), he could eat, give or take some empty space between the q tips, 3ish boxes, or just around 1500 q-tips.
Now, digesting the things is another matter. I assume that is “rushed into the ER to have a mass taken out of the intestines” territory.

