I had the same thought, and checked a dozen or so of them, they're all multiple dozens of balls.

The submitter's description does make reference to this a bit, the Amazon product description quantity for these items is "1"...

And it gets more complicated for the ones that are 2 dozen, plus 1 dozen 'free'...

Yeah... I'm just now realizing how relying on unit count in the listing is more problematic than I thought. Sellers say their unit count is 1, but the product title says it is 4 dozen. I need to figure out how to fix these inconsistencies.