9000 - Water in the boot.

Hi I cant believe this - Ive had 3 x 9000's before and never had a problem with them, but Ive found the boot carpet either side of the wheel well soaking wet. Theres nothing in the wheel well except for a slight run off from the carpet. The boot door seals are good so I c'ant figute out where its coming from. The car is an anniversary model, its the first i've had with a/c and am begining to wonder if its anything to do with condensation or the rear spoiler perhaps. Has anyone else had this sort of problem .......... any ideas? thanks ROD