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Would not be a ring..there would be big chunks of piston in the oil. Not likely anything from the timing chest..and if it is steel..there should be some big time collateral debris in the engine oil.
Someone may have dropped some junk inside the valve cover when the valve adjustment was done.
Most shops have a parts cleaner that is used for cleaning everything..and they do get old engine debris in them..and if you are not paying attention while you are washing your 911 valve cover..the old metal bits get brushed up inside the valve cover.
I used to find some interesting things on the old 911 engine oil sump plates..sockets, nuts, washers..feeler gauges, etc. With the 3.2 drain plug..no sump plate to collect and inspect bits dropped inside the engine.
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