I've been finding water in my rear glove box for a while now. I've just fixed my trunk pulldown (for $25.00 ) and I have a feeling it's gonna take care of the problem. I'll let everyone know if it does.

 

I've had that happen a couple times. It's usually only when the hatch isn't shut right. As long as the electric pull-down works right, then it shouldn't happen.

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89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph

 

I would suspect that the weather stripping for the hatch is no good. Check under your rear seats to see if there is water and/or rust there.

 

pull out the innards of the rear glovebox and check for a rusty hole