If the packing list mentions Amazon, you probably bought from an eBay dropshipper. They scan Amazon listings and repost all the listings +X% (where X=eBay fees+

If the packing list mentions Amazon, you probably bought from an eBay dropshipper. They scan Amazon listings and repost all the listings +X% (where X=eBay fees+profit loading) to eBay. When you order from eBay, they just go ahead and order from Amazon on your behalf. If you look up the product you bought on Amazon.com, you'll probably the find the price to be lower than you paid.