Well WW, let's assume that the guy with Alzheimer's knows he has a house, he's just completely forgotten where it's at.

And you can lose something but still have it in your posession...for example, say NASA sends a probe to an asteroid to have it bring samples back to Earth. However, something goes wrong and the probe can't thrust itself out of the asteroid, so it's stuck there.

NASA still "owns" the probe, but it's now lost. Naaaaah mean?