@motorbikz are you aiming to collect / have already collected all of the 10oz kook proofs, or do you just buy the proofs of the kook designs you like?
2014 kooks not shown because APMEX decided to send me 20 loose coins instead of a sealed roll like they're suppose to . Nothing too special about these. I like the newer coin designs of the modern kooks (2011 - present) compared to the older kook designs, so that's where I'll start my collection.
For me, in American terms, this thread is a high hanging curve ball. 2001-Kookaburra by TomD77, on Flickr 2011 Kookaburra by TomD77, on Flickr 1991 Kookaburra by TomD77, on Flickr
I hope you sent them back and got an exchange? I wish I had time to show my rolls, maybe late next week.
No I wouldn't dream of trying to clean a proof, I always try to buy the very best condition coins first off and hopefully they stay that way.