Those peices are the vac' pump check valve parts.
Would suggest you also remove lower oil pan and clean out the other pieces
and debrie that may have fallen though before the get sucked up by the oil pump.
Although the pick up for the oil pump has a mesh screen...I have seen the screen with gaps large enough to allow small items to be sucked up.
There will be a rubber foot buffer held on with a C clip on the end of the oil pump pick-up ...I personally remove this rubber buffer and place in the oil pan a large voice magnet under the oil pump pick up.
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