My Paper Money Collection - Question

I have some old civil war money:



Some earlier one, two, and 20 dollar bills. Also, a small Three Cent bill.




I have a question about the 20 dollar bills. My grandfather had a note attached talking about how the bill was "before the Truman balcony was added" and to note the "large US seal under twenty." He said he was going to contact a money buddy about it, but no idea if he did.

Here's the back of them:


No idea if anything of value. Don't know much about them. I like that one of them is taped up, I do that sometimes.