I had a look today to see what seats would be available on a SYD to SFO flight if I tried to book my refundable business class ticket today instead of when I purchased it a month ago. When I checked to see what Business Class seats were available, it gave you a choice of seats in rows 1-4 on this 747-400 (they were letting you choose First class seats when you're purchasing a Business Class ticket).

When I go back to the seat selection on my ticket, it shows the remaining business class seats on this flight that you could switch to were 7D, 7G, and 8G (no thanks). Is there a way to graciously offer to take sit in seat 2K so that someone purchasing a business class ticket today can have my business class seat? What happens to those remaining unfilled first class seats, do they bump up the 1K passengers?