I was thinking of something different: Amazon sells X, and super-sketchy company B claims to sell the same X "fulfilled by Amazon." I believe Amazon ships from

I was thinking of something different: Amazon sells X, and super-sketchy company B claims to sell the same X "fulfilled by Amazon." I believe Amazon ships from the same stock to people ordering from both A and B. In other words, even if you order your X from Amazon, you might get an item from B's stock, since they're mixed.