They are just a screw covers, nothing to do with water ingress.
Also there are no seals for wing lights other than grommet on the cable and paper on the nuts. More likely to be something on the boot lid letting water in
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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