Some of it (e.g., the piece in the bottom center) looks like excess sealant - and is meaningless. Others will have to comment on the other stuff. It's either sealant or fragments from the chain tensioner guides. Have you checked the cam deviation with a Durametric?
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2000 Boxster S, 6 speed, Sport Package, Litronics, LED tail lights, LNE IMS-B, OBC, Skybreaker wind deflector, Arctic Silver/Graphite Grey
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