I now count this as the 2nd positive development update I can recall in 10+ years from Amazon (the first being the ability to set holidays and keep receiving orders):
Through Buy Shipping, you can now purchase multiple labels for single-quantity items that you ship in multiple packages within the US.
Previously, you were not able to purchase multiple labels for items that required multiple packages, such as sofa sets. Now when you buy shipping for your seller-fulfilled items, you can select the package count and review consolidated shipping rates. Each part or piece of your product listing will get its own label and tracking number.
We’ll create a unique shipment ID for each package, which means we can track your valid tracking rate and on-time delivery rate for each package. This package-level tracking also helps us process A-to-z Guarantee and Seller Assurance for e-Commerce Transactions (SAFE-T) claims.
Customers will get individual tracking and delivery dates for each package in their order, giving them clear visibility into when each one will arrive.
If a customer initiates a return for a Multi-Package order, Amazon will issue one return label. For questions about handling multi-package returns, contact Selling Partner Support.