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Read onlyThe shipment of IOSS orders must meet specific customs requirements. If you are shipping directly to the customer, you must provide the Amazon IOSS VAT identification number, VAT exclusive order value and Order ID to your shipping partner or customs broker
As has been the case for the last 4 years.
Is there a question in your statement?
you are quite correct and services like clicking drop can add this data, and a little loss symbol can be seen on the shipping label to confirm that data has been provided
any such order will show amazon IOSS number ( Vat collected by Amazon) on the order details page! which you can give it to courier at the time of purchase of the label of if buying label directly from amazon it automatically does that for you.