I found a product with weird dimensions. Please help

I bought a ton of a clearance pillows at walmart which have the dimensions of 16 x 24 x 3. The listing says the product dimensions are 15.1 x 6.6 x 4.8 inches .

Doesn’t the inventory products dimensions determine the Fulfillment Fee for amazon? Even if I can squish this pillow into that item size, wouldn’t amazon be upset about the pillow unfolding into its full size when taken out of the box?

Please help. Thank you!