The 1970 is a chip but the 1988 could be just a gas bubble(zinc rot). Even if the '88 is a chip I wouldn't keep it because it does have rot,below the "D".
Value is minimal on one or two chips but become more interesting with three or more. Location of the chip also can peak interest. It would be interesting to start a collection of wheaties and memorials with die chips. It could be challenging for some dates and mintmarks.
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