talk to previous owner, ask what work has been done.
could be top end related, if missing indeed not so good that its without as they take care of parts alignment, but you can only find out by disassembly....
measure and post the dimension, to me it looks like one for an M6 bolt, so could have been rocker cover related and it simply dropped down through the cam chain tunnel.
bad mechanic in any case!
yes, you are lucky it didnt jam the transmission or something. that why its good to have a magnetic sump plug, in theory it could hold any loose bits in a safe place.
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