Anyone know what these are worth? I have 4 that are all still sealed in the mint pouches. They are 9999. Called around to a few coin/metal dealers and most in my area are offering spot gold price plus 2-3%. Should I be asking more for these or is that about right? Also, would it be worth it to hold on to a couple? Are these likely to become very collectible/valuable in the future? Sorry if these are dumb questions as I am not really a collector. Thanks!!