It does happen with Amazon UK, or at least has within the last year because I've twice had it, first time with a microsd card, second time with an ssd.
They obviously replaced it no problem but it highlighted they were either still mixing stock or were using a dodgy supplier themselves.
For what it's worth, been buying from Amazon for the past 15 years or so, and not once received a counterfeit product. Granted, I still don't like they they mix up their inventory, but I think it's a smaller problem than people make it to be. Most people are buying household supplies off of Amazon; that's not really a category that gets affected by counterfeits.
B&H is a hidden gem. I came across them because I needed a camera, but they sell lots of other stuff and their sales team consists of actual humans who have physically used the products they sell, and a supply chain they actually control. In the past, I’ve talked to a real human there who:
* verified the un-advertised compatibility between an accessory and the device I was buying it for (hours of googling had not been able to confirm this for me)
* explained their personal experience with both the Sony and Canon cameras I was considering
* nearly price-matched another vendor’s sale on a large purchase of Dell monitors
They have their own warehouses with real physical stock ordered directly from suppliers, (no drop shipping and no third party sellers.) One order I received even came with a hand written note signed by the salesman who’d help me select it. A nice touch, but impossible for an operation at Amazon scale.
These days B&H is my preferred vendor for PCs+components, AV gear, SMB network equipment.
They obviously replaced it no problem but it highlighted they were either still mixing stock or were using a dodgy supplier themselves.