Good afternoon @Seller_oKJzx1QiAcFJL and great question!

As the previous commenter mentioned, Amazon can apply labels on you behalf via the FBA Prep Service:

"Use the FBA Prep Service to ensure that your products are properly packaged and prepared for fulfillment. Correct packaging and prep helps to reduce delays in receiving time, protect your products while in Amazon fulfillment centers, and create a better customer experience.

If you use the FBA Prep Service, Amazon will prepare your eligible products for a per-unit fee. After you enable the service, you can choose whether you or Amazon will prep the products that you send to fulfillment centers. When you build your shipping plan, we will provide an estimate of the prep fees based on the expected services for the selected products."

If you're interested in the program, I recommend reading more here! (The other link wasn't working for me)

- Bryce