I do collect coins, mostly proof coins, but am fairly knowledgable in all. I also have a number of reliable sources for current coin values and have just looked up the two coins in question.
First let me say there are two big things that effect a coins value; how rare a coin is which is usually based on age and the number minted, and condition which will depend on if it has been in circulation and how it has been kept, age also playing a role here. When it comes to coins there is also a fact most do not know that will effect how rare it is, coins minted in different locations are considered to be different varieties of the coin so have different values associated with them. So while a coin that has a large number of coins minted in a given year at one mint may have little value, that same year a different mint could have minted very few of the same coin making its value very high. These coins are identified by what is called a mint mark, which is a very small letter, usually following the date. There can also be no mint mark which just means it was the one mint that does not use a mark.
Now for the coins in question. Since I do not know the mint mark or condition I can only give you a range for each possible mint. Since the coins have been handled by human hands and stored in a desk they will not be graded in any of the grades of MS60 thru MS70, MS standing for Mint State and 70 being a perfect coin. But just for the purpose of showing how the mint the coin was produced at will effect its value I will give you the values of the different mints for these two coins in one of the best condition for each.
For the 1922 Peace Dollar in MS66;
1922 no mint mark = $785
1922 D = $2,000
1922 S = $20,000
For the 1880 Morgan Dollar in MS65;
1880 S = $230
1880 no mint mark = $800
1880 CC = $1,650
1880 O = $26,000
Now for a realistic value of your coins. Ranging in condition from VF (Very Fine) to AU (Almost Uncirculated). Uncirculated meaning Mint State.
For the 1922 Peace Dollar;
1922 no mint mark = $15 - $18
1922 D = $15 - $18
1922 S = $15 - $18
For the 1880 Morgan Dollar;
1880 S = $16 - $22
1880 no mint mark = $16 - $22
1880 O = $16 - $27
1880 CC = $200 - $300
As you can see from the values above, where a coin was minted and its condition make a huge difference in its value.