believe you are way over thinking it. If your concerned, just drain the coolant and replace it. It's an easy job and pretty cheap. With what your 1st & 2nd plan is you will spend more time doing that then it takes to just drain & replace. As long as whoever put it in last didn't use DexCool you wont need to even worry about the tests.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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