My friend has a long unopened tube with 50, 1964 canadian pennies, how do i find out what they are worth, if anything..

I am interested in buying some gold coins, like the American Eagle, Canadian Maple, etc.

I want to buy it for investment.

So it is it necessary/important that I get them in their orginally sealed state (as from the mint) and with a authenicity cerficate of BU (brilliant uncirculated)?

Or I can just get them in uncirculated conditions? and still be able to sell them with equal values as the sealed ones?

Thanks