Sorry, I was thinking you might be able to use theSeller Discounts & Charges part of the invoice - not the actual Postage section ?

And yes, I have offered an additional item of their choice in the past and/or if they have paid suffiient postage to cover Registered Post, I message and explain and usually they opt for me to send Registered, which I prefer just for a little protection 🙂

Touch wood, never had a Registered local go missing yet. Lol, let's hope I didn't just jinx myself !

Cheers and thanks so much for your time and comments