Bought a MSD 8534 off a member here ( see Photo of what I got)

SGBARRACUDA said
I agree with^^, That was my thought that the seller had not had the cap off in a while and especially before he sent it to me. That is why I asked him in my first contact after receiving it "I got home today. The packaging was great , the outside looked great. Have you looked inside of it lately?" It was his attack on me that caught me off guard.
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Like I said I was shocked when I pulled the cap off of mine, I'm not really sure what an acceptable resolution will be between you and the seller but I know and as others have stated, for whatever reason, those MSD distributors seem to naturally get that way with the moisture in the air I guess.