In challenging the adequacy of an agency search, it is not enough to bring “purely speculative claims about the existence and discoverability of other documents”8 For example, in a FOIA lawsuit where a requester sought images related to the May 2011 raid on Osama bin Laden’s Abottabad, Pakistan, compound, the requester argued that the Secretary of Defense was likely to possess responsive images in his office — and his office should therefore have been searched — because he had advised President Obama