The spy satellites are more concerned with photographing military targets. Even so, had they been tasked with photographing the ocean, you would've needed quite some luck to have taken a picture of the right area before the debris got scattered out blending in with all the other debris floating around.. Not to mention the manpower needed to sift through all those photos. There was a crowd sources effort to look through satellite photos, which turned up empty.
Biting the hand that feeds IT
