PCGS 2016 silver American eagle struck thru retained plastic obverse. The plastic threads are retained throughout portions of the struck thru area.   What the threads came from in the Mint is...

Struck thru plastic obverse, with the long, triangle shaped strike thru at 3-5 o'clock. 

PCGS 1990 Silver eagle struck thru numerous retained wires on the obverse. There are many small, thin wire fragments scattered across the coin's obverse, and especially in the 11 o'clock area...

NGC 2015 silver eagle with a retained struck through obverse, which is an orange/yellow color.    MS69

NGC 1998 silver eagle struck through obverse and retained debris. The debris appears to be hardened grease or a dark glue-like substance.    MS69

NGC 2017 silver eagle struck thru and retained finned rim reverse. The coin has a long, thin sliver of silver metal struck into its reverse, which is from this or more likely another coin's "finned...

PCGS 1992 silver eagle with a large struck through plastic obverse. Larger than normal, and extending from Ms.Liberty's head to her foot.   MS66

Small, retained struck through obverse at 8 o'clock. The struck through appears to be a piece of glue or hard black matter.