how much are these old coins worth?

united states liberty coins

1986 1 dollar
1983 XXIII olympiad los angeles (1 dollar)
1986 half dollar

and then canadian coins:
manitoba 1870.1970
it says 1870 and then a dot in the middle and then 1970

all the coins are big and fat. mint condition, sealed in a plastic container.

1986 half dollar coin specifications
diameter:1.205 inches
11.34 grams
.33 troy oz copper
0.3 troy oz nickel

are these coins valuble? can i sell them on ebay? or should i just hide it in my attic?

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