Jim Oberg asks -- were there any other possibile sensors thatr might have detected (but not identified) this bogie? Visual? Radar? IR?

The object in question was detected by the LINEAR optical sensor. Had other optical sensors been looking at the right place, they might have detected it, too. The GEODSS sensors are supposed to be able to detect a volleyball sized object at geosynch, so they might have been able to track the object if its reflectivity was high enough. Many natural space objects are very dark, so it's possible it might be below the level of detection for many other sensors.

Several deep space radars could've tracked the object if they had cueing data to know where to look. Space surveillance radars are either mechanical trackers like Millstone (part of MIT Lincoln Labs) or phased arrays like Eglin (Florida). Mechanical trackers have a narrow beamwidth, so they need to know where to look to find something. Phased array radars can project an energy pattern (called an fence) that typically defines a line across the sky. Most of the time, the fence doesn't reach out high enough to detect this object. Missile warning radars are typically aimed even lower.

However, there is one old space surveillance radar system that should've been able to detect this object if it's path was right. It's the old NAVSPASUR multistatic radar. If the object crossed the US through the 33rd latitude parallel, then NAVSPASUR should've been able to detect it.