That is what I was wondering. Would love to see the famous receipt as well.
I do know that if you get a booking re-fared, or make changes you lose amenities. At least that was the warning on my booking: The devil is in the details.
"Included Crew Appreciation (previously called complimentary shipboard gratuities)
The amenities included above are assigned to this booking. Any changes to price, cabin, category, sailing date, promo, etc., may result in a change of amenities."