According to Malcolm Douglas who was helping on the old thread: "There are some 23 examples in Greig-Duncan volume 4, which I don't have."
The letter is mentioned in the 1828 broadside:
So now my dear daughter I have deprived you Of your love whom I have sent to see; (sic) And now you may send him a letter, With your misfortunes acquainted to be.
In the 1901 version, the UK rap song:
O, who is that that raps at my window As I lie on my bed of ease? I'll go and write my love a letter, And he will read it when he please.
And in a dozen of US versions- to me it's mysterious connection- the broadside is more clear of the letter's intention.