I would then assume that if you ordered, say, an extra entrée (a $5 upcharge if you've already had 2), you would then have to sign a receipt? Or as in my case where I am sailing on the Paradise which has not specialty restaurants, if I were to order from the STEAKHOUSE menu, this also would generate a receipt to be signed?
I learned to SAVE all receipts throughout my cruise to compare to the final invoice. 😉