Put the case of beer in Cold and fill it with ice. This is really not a true test. Ice coolers suffer most from being opened and closed all the time. Do your test and drink the beer at the end. Do another test but drink the beer during the week opening and closing the lid each time you need a beer. I think you will have good results with test one and acceptable results with test two but either way you should be pretty happy just drinking cold beer.
Did you ever notice that a beer from the fridge is pretty good but the same beer from an icy cooler is way better?