this is getting old, hilarious and somewhat maddening! i drove with the rear seats folded down and a new rattle showed up! this time it sounded metallic. so, after a couple of miles or so i pulled over and returned the rear seats in their upright position and drove for several miles to the mall.....not a squeek.
i might just give up trying to solve/fix this pesky rattle. it is not obnoxiously loud and it is intermittent, but it just irks me because this is a new car! i know i will eventually be able to completely ignore it as if it's not there. who knows, maybe it will go away on its own. for now, i will just enjoy my new edge sport!