I'm sure you don't have a split fold down rear seat, or you would have crawled in and hooked up the battery by now (or looked for an emergency release handle on the trunk lid). I'm not familiar with yor model, but maybe someone who is could weigh in on the feasibility of removing the rear seat back.

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1996 C280 289K Traded
1997 E420 167K Traded
2001 S430 240K Traded
2010 E550 4matic 80K
2000 GMC Jimmy 198K Gone to Boneyard
2003 Camry LE 196K
2011 Mazda3 i Sport 31K