I am right there with you - have drained the oil multiple times and found a few small foil fragments but certainly not the whole piece.
I had an oil leak like you - mine ended up being the oil fill tube. It is really thin plastic and on a 17 year old car, had gotten brittle and cracked. It is a DIY project to replace although quite a pain in the rear; made less awful if you have a cable actuated hose clamp tool (replacement process still sucks!) I also found that adding oil rapidly (from the collection pan to the fill tube) can lead to overflows in the fill area (in the trunk) and that area has a drain tube that exits directly to the ground in the right rear of the car...
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