Canadian Coins: Rare Varieties?

Thanks. I have some more questions:
How about 2001 quarters with no P? Are those the rare ones, or the ones with P are the rare ones?
Is there really 2001 and 2006 nickels that has P and no P, like in 1999? Are they rarer?
With the silver coin the front looks more worn (the Canada is almost all worn off) than the back (you can still barely see the wreath and shoulder). How to grade it and what should I give?

I'll be going through some change again today and hopefully I'll find something interesting.

Hi, sorry for not replying sooner, but this week was pretty full of assignments and everything. At least I have a break now, even though it will be most taken up by doing two projects.

Thanks, wazzappening. That's a great site! I've been looking at it and it's really helpful. I've learnt a lot.

By the way I traded for another batch of change this time $10 at face value. Didn't find anything particularly interesting, but I did find a 1963 penny that looks like there's green carpet growing all over it. Also a strange splotchy 2008 nickel with some green in it, and it also feels rougher than normal coins. Should I separated them from the other coins?

And apparently I've also been correcting the wrong coins, The 1992 and 2002 coins with 2 years on them are not limited mintage, and the 2001 with Year of Volunteer on it, that's why I find so many of them.

I also found a 1939 Jefferson nickel. Quite worn though. Feels pretty heavy, I'm kind of surprised by how much copper is used in US money.

I also found these two quarters that are so mangled. Can you believe this? I wonder that was done to them.