Good on the NRT airport authorities to check on FODs. About 6 or 7 years ago, a KAL B744 pranged the engine on landing and the skipper kept quiet about it after the walkaround for the return flight hoping that it will be foisted onto the next unfortunate guy! Unfortunately this piece of work was an expat
This is what I gathered from KAL safety dept: the skipper calimed it was raining heavily during the transit for the turn round flight so he did not do the walkaround check! Also it was f/o's landing!
If those were true, really riff raff of an expat skipper for KAL.