OP, you don't need to do anything. The darker panels were exposed to sunlight longer then the rest and most likely the top sheet on the bundles. Sometimes a wholesaler stores the OSB outside until they have time to make room for it. It can turn dark like that in 3-4 days. When it turns white, then you know it's been exposed to rain and sun a lot.
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Osb should never be used on roofs
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Probably 85-90% of all houses built in the last 15 years are decked with OSB. Beats CD plywood by a lot. With CD plywood, you have a plywood that is put together with exterior glue but wears an interior grade stamp. Any plywood with a D face will be graded as an interior product. You'd have to move up to CC grade plywood and that's an expensive date just to get an exterior grade stamp. AC is even more money and neither will out perform OSB. OSB can take complete water immersion and come out just fine. Rarely will OSB suffer damage from a leaking roof, unless it's been leaking a long time. Plywood won't take a water leak very well and usually if it gets wet more than once, it's done. OSB is not to be confused with particle board.
https://en.wikipedia.org/wiki/Oriented_strand_board
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