i am not sure if this the right place to post this question, so feel free to move it if necessary. we have been collecting the 2008 Nelson Mandela R5 coin for a few weeks now hoping it may be worth something but today my wife came across a 2000 Nelson Mandela R5 coin and i see some people are selling them on the auction sites. do any of you on the forum know anything about these 2 coins?