Just an update:
I called Palm's Corporate Office yesterday to express concern over the missing part and the missing serial number and the suspicion I have that someone in the Pharr, Texas repair center may be less than honest. The conversation was lengthy (appx 20 minutes) during which the rep pulled up images that were made at the repair center of the Palm I sent and that was supposedly water damaged.
He said there are sensors inside the Palm that turn blue when exposed to water. If I understood him correctly, there are four of them. He said he could see no indication of blue on any of the sensors in the photograph they made of the inside of my unit. Since the stated purpose of these photographs is to document the condition, it is strange there is no blue showing on any of the four sensors.
The plot thickens.
It seems the further I get into this thing, the more I am convinced that either there is a thief in Pharr, Texas or the Pharr, Texas repair center is riddled with incompetence. But, the stripped serial number makes me strongly lean to the former, especially since too many people have good experiences. I think there is a bad apple in the barrel.