I may be misunderstanding the links you're providing, but to me they only appear to say that Amazon is aware of the original source of each unit sold. They don'

I may be misunderstanding the links you're providing, but to me they only appear to say that Amazon is aware of the original source of each unit sold. They don't appear to say that a consumer has any control over which bin a product is pulled from. i.e., A consumer may choose to buy a product "sold and shipped by Amazon" and it may get fulfilled from a bin supplied by a third-party. The Financial Times article you linked to seems to confirm this.