indeed Magnet - so thats another thing to check - the info i gave was based on the 2012 A8 that i just purchased and the info i gleaned b4 buying it as for my brain its been well used over the years and i would never claim it to be the source of superior knowledge - lol
I was under the impession that A8s have aluminium bodywork - having said that it may have had a "steel" repair or a replacement third party door - check with a cloth covered magnet