I don't know, I'm just going off based on their documentation: https://sellercentral.amazon.com/gp/help/external/200141480?language=en-US&ref=mpbc_200243180_con

I don't know, I'm just going off based on their documentation: https://sellercentral.amazon.com/gp/help/external/200141480?language=en-US&ref=mpbc_200243180_cont_200141480 https://sellercentral.amazon.com/gp/help/external/200141480?... It says: > 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. So at least their documentation clearly says that each seller's items are stored grouped by seller.