Usually, canned cat food comes in a cardboard box with the manufacturers branding and some important labels, along with X number of cans inside arranged and kept tight in some fashion.
This one was literally a bunch of cans inside a sealed, transparent plastic cover (and then inside the regular amazon box). When I checked the product page from which I purchased, it had only a handful of reviews (versus the usual 1000s of reviews on the real thing), but it had the correct supplier brand name. After reading a bunch about the colocation of products, this was fairly scary.
Nowadays I just buy from Chewy / Petco / Petsmart etc. It's just not worth the risk.
Edit: don't mean to add some FUD or anything with Amazon, I was just expanding parents comments about baby supplies with pets as well. Still buy a lot of stuff from Amazon, but not anything where I stand to lose more than money.