Try slowly pouring a large kettle full of hot water over that section of the bumper - it may well pop out, if you're lucky that is.
I have a heat gun so I'd simply try it with that, if it didn't work I'd them look at how to get the rear bumper skin off so I can push from behind (after heating)
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2001 Boxster S, TipTronic in Seal Grey aka "The Imp"
2001 TE50, ESS in (now) Grigio Titanio Matallizzato aka "The Golden child"
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