>Yes I know about comingling, but Amazon does not comingle their own interventory with 3rd-party sellers. (Apparently they may have in the past but do not anymore.)
Source?
Edit: This page from Amazon does not state shipped and sold by Amazon is excluded from commingling.
> For inventory tracked with the manufacturer barcode, each seller’s sourced inventory of the same ASIN is stored separately in our fulfillment centers. We can also track the original seller of each unit.
That doesn't say items sold by Amazon.com are not subject to the following:
>We may fulfill that order using another seller’s unit of the same product if it’s closer to the customer
Another piece of evidence that Amazon doesn't really want to be a retailer is that they removed the option to filter items to only shipped and sold by Amazon.com
> For inventory tracked with the manufacturer barcode, each seller’s sourced inventory of the same ASIN is stored separately in our fulfillment centers. We can also track the original seller of each unit.