It is well documented that the Army of Northern Va was under orders to not rob or pillage. These standing orders came form the top i.e. Lee. This is why when CS cavalry sacked Chambersburg is was a huge deal. It was so out of the ordinary, read the papers from the period.
Your post is cannot be substantiated. What can be verified is the standing orders from the Army of Tennessee to glean as much from the enemy as possible, forage included destruction, and to destroy anyone one who opposes Federal authority, the opposite of Lee's order.
A lot of yahoos claim the money the rebs would by goods from farmers and merchants with was worthless, but it wasn't there were money changers that would convert CS dollars to US Dollars and vice versa.
Of the union Armies the best behaved so to speak was the Army of the Potomac which never really had to forage as supply and logistics was its forte - not fighting.
Agreed, but orders from the top did not always translate into good behavior by every soldier, especially when lower grade officers were willing to look the other way.
Allen Guelzo's recent book on Gettysburg discusses this question at some length.
The reality was, as reported by Confederates themselves, that once across the Potomac into Pennsylvania, troops were allowed to do pretty much what they wanted, with or without formal "requisitions".
You mentioned Early's 1864 burning of Chambersburg, PA, but that was only the last of three Confederate raids on Chambersburg, the second being Lee / Ewell's Corps in 1863, which Guelzo describes as quickly descending from huge "requisitions" to confiscations, to robbery & looting to finally simple vandalism (see chapter 5).
You know, I've long argued that in the greater scheme of things, especially when compared to other armies at other times in other wars, our ancestors on both sides were better behaved than any you can name.
For just one example, my estimate is that the number of civilians who died directly from the Civil War was in the neighborhood of one for every thousand soldiers killed.
Compare that with WWII where two civilians died for every soldier killed -- no comparison.
But there were some atrocities, looting and destruction, on both sides, neither remarkably more or less than the other, when opportunity and need were present.