I have some old version Hong Kong currencies, from "Yau Lee Bank" and some special number bank note from Chartered Bank (old version), eg. AA8000008 etc. and some others old version bank note varies in amount - 1 cent and 5cents (king head, not queen head), $5, $10, $20, $50 and $100. All are brand new and straight. I am wondering should I sell it or just keep it. What will you do?