Earlier quoted context omitted.
Yeah, no, you got lucky with that - I found out Amazon can't be trusted with high-ticket items by getting a $1200 lens that turned out to be gray market. Works fine, but I better hope I never need warranty service. Amazon can't be trusted with high-ticket items, including but not limited to camera equipment. Go to B&H or Adorama, or Newegg or Micro Center for high-ticket computer parts (cf. the recent spate of GPU sc…
Every retailer you mentioned deals in grey market products. Here's B&H proudly admitting to it: https://www.bhphotovideo.com/c/find/HelpCenter/USGrey.jsp
This is not typically the case if you get a grey market lens on Amazon. It's also something you'll be told on the listing.