The Chicoms are obviously testing us to see what we are NOT looking for.
From the story here:
The incursions in the past week have changed how analysts receive and interpret information from radars and sensors, a U.S. official said Saturday, partly addressing a key question of why so many objects have recently surfaced. The official, speaking on the condition of anonymity because of the sensitivity of the issue, said that sensory equipment absorbs a lot of raw data, and filters are used so humans and machines can make sense of what is collected. But that process always runs the risk of leaving out something important, the official said. “We basically opened the filters,” the official added, much like a car buyer unchecking boxes on a website to broaden the parameters of what can be searched.