prizee, 2011 Anthracite is indeed very green under bright yellow lighting. I had one and sold it due to the green undertones. On the day I decided to sell it I was shopping at Kohls wearing jeans and a grey print top, and the bag looked so green under the lighting that it clashed with my outfit.
In other light sources it looks dark grey with blue undertones. Some Anthra bags may have more or less green but they all have it, from 2010 onward. I also think that some people only see the primary color and not the undertones. Anthra is a very subjective color depending on who is looking at it, but I saw what you did!
Your best bet is to check auction sites for a 2008 or 2009 Anthra as both years had less green tones.
In other light sources it looks dark grey with blue undertones. Some Anthra bags may have more or less green but they all have it, from 2010 onward. I also think that some people only see the primary color and not the undertones. Anthra is a very subjective color depending on who is looking at it, but I saw what you did!

Your best bet is to check auction sites for a 2008 or 2009 Anthra as both years had less green tones.