Good pictures! ! They look like normal circulated halves to me. The yellowish color is normal circulation/toning from the environment it's been subject to. Give them an acetone bath. Lightly wipe the surface with an acetone saturated Q-tip. The one with mint luster should clean up nicely. Nice find!
Post pictures of the results after the acetone bath. Remember, do not scrub them. Very lightly with a saturated Q-tip.
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