If it's not a 28, that's good. SPare parts for your gun. It's probably in teh case, becasue it was considered a spare part for your rifle. This is a good sign, as it shows the previous owner may have upgraded other parts to real HK parts. (BW5's were notorious for bad extractor springs, and a lot of clone owners often fixed other issues by installing HK bolt parts.)
ETA:
Just hit me that teh real HK part may already be installed in your gun, and that the one in the bag is the take off bobcat peice.
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