Pretty sure it's been discussed before but I was reading about the 3 sacred treasures of Japan (sword,mirror and a jewel) Instantly thought of shenmue.
Ryo takes the sword hand guard to Hong Kong doesn't he?Though the sword at the end of II makes much more sense than the hand guard.He also possess the mirror.The jewel can be the yin yang piece that Ziming gave to Xiuying (not a jewel but just a guess.Could be a jewel that we have yet to know of)
Here is the wiki article to anyone who's interested.