Royal Dutch Shell...has become embroiled in a bizarre legal case after more than 150 boxes of sensitive documents from one of its former subsidiaries were discovered buried in the New Mexico desert...The papers were found last Friday...after a former employee of the Texas-New Mexico Pipeline Company, a former Shell subsidiary, turned whistleblower when questioned by lawyers investigating an oil spill in the area...residents claim that well water was contaminated by oil from the pipeline in the early 1990s