Box Content cannot be changed once you set it and create the batch. But you can do a workaround by uploading a shipping plan for the batch, and in this way, you can input the box settings on your own in Seller Central.
If you have a batch that is set for Box Content, but then decide you don't want to provide it through InventoryLab and want to provide it on your own in Seller Central, you will have to send feeds only. This is when you have listed all of your items in the batch and are ready to create shipments. Click on the Create Shipments button, but make sure that the Create FBA Shipments box is unchecked so that you only send the feeds (as shown in the image below).
This will close your batch and allow you to begin the process of importing a shipment plan into Amazon, as it takes you to the closed batches page and displays this batch. If it does not take you there, then go to List>Closed Batches and click on your batch name to open it up in your screen.
Once the batch is open, you will see a Restore button and an Export button in the upper right corner.
Click on Export and choose Shipping Plan File. This will give you a properly formatted .txt file:
- Note: You must wait 15 to 30 minutes for your feeds to fully send your listings over to Amazon prior to uploading your Inbound Shipping Plan into Seller Central. If you attempt the upload too early, Amazon will give an "Unknown SKU. The SKU for this product is unknown or cannot be found." error.
Now, you're ready to upload! Simply visit this link (click here) and upload the file by going to step 2 on this page (step 1 was done when you exported the file from within InventoryLab). This will create a shipment plan with the items you listed with InventoryLab!
Now you can create your shipments and also take care of the box content from the shipping page since all options will be available to you.