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LM393A: Are there any rules for judging the finish of component lead tips?

Part Number: LM393A

Thank you for all your support.
Please advise me.

My company inspects the finish of component lead tips on TI products purchased from non-authorized channels.
However, I am always troubled by how to judge whether it is good or bad.

I compare them with those purchased through the authorized store route, and if I find any difference in the lead finish, I judge them as defective.

The lead finish of Sample No. 2 was judged to have corroded plating. Is my company's judgment correct?

Are there any good/bad rules for the finish of component lead tips?

If so, please tell us how to judge it.