The 5 oz. gold Pandas are all proofs, there are no B.U. gold coins in that size. I know a book that shows all the coins but, if I may suggest, you should work with a dealer like Nick at Majestic Rarities (
http://www.majesticrarities.com/) or William at PandaAmerica (
http://www.pandaamerica.com/panda_coin.asp). These are people whose stores regularly carry these expensive Pandas and will make sure you get the kind of coin you want and not a hunk of gold-plated copper.
Best wishes,
Peter Anthony
http://www.pandacollector.com/