The "diagnosis" of the leakage is complete. In short, the Nissan tech's statement on the pre-purchase inspection that the rad cap was leaking was incorrect. The small OEM clamp closest to the cap was what was leaking.
How do I know? Because I drove the Z for 3 hours on Sunday during 27C weather. Also got in a little bit of 120-mph "track time" on a remote "raceway". Checked for coolant leakage before, during and after this driving experience and there was absolutely none.
Likely the original cap was also not leaking, but because I had to return the cap to Nissan in order to get the replacement cap under warranty, I can't re-install it to determine absolutely that it was also not leaking.
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