Usually one copper washer fits the drain plug and the others go into my copper washer bin. Sometimes they give you O-rings for the filter shaft, but I have better Viton ones there. Always change the thick cover O-ring since the old one likely went flat. I save the old ones in a bag since often end up using them on another car for something non-sealing like a cushion or spacer. Insure you don't trap any wires or hoses under the cover (feel for them) or you will get a massive oil leak (how would I know?). Easy to do since they crowded a bunch of stuff around the top of the filter housing in my 1984 and 1985.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans