This makes zero difference. The Amazon part will be shelved in the same bin as the part sold by "Bob's Auto" and shipped by Amazon. So you have no idea where it originated. Its whatever one the amazon employee grabs. There is zero protection with "sold and shipped" by Amazon.Amazon can have great prices at times, but unless the item is sold and shipped by Amazon, you're at the mercy of the third party vendor.
Now I am happy to buy something that is unlikely to be counterfeit. But commodity items like filters or spark plugs from Amazon - no way.