You can choose not to comingle your items. In this case you must relabel them with custom bar codes. Amazon will only then use your items for your sales and no

You can choose not to comingle your items. In this case you must relabel them with custom bar codes. Amazon will only then use your items for your sales and not for anyone elses. Possible longer shipping times, etc. But I s always been possible to ensure correct items on the seller side with FBA.