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Hello my name is***** and thanks for your question.
The tank does not share any sealing seams with the body. Actually the tank does not use any caulking or sealer.
Was there any drilling in the trunk or any screws driven through the front area of the trunk?
It must just be coincidental then. There is nothing else you could of done to cause the leak. Slamming the lid should not cause a leak either. Is it leaking into the trunk or under the vehicle?
In my opinion I think the fuel tank needs to be removed and the leak source found. If it is leaking into the trunk it is eventually going to find its way to other areas.
Ok then best of luck