I don't know.
I have a 1954 $1.00 that has had its serial numbers removed but you can see a trace of white where the serial number once was. BWJM, eyevet, and a few others saw this note in Paris, and all confirmed that the SN was chemically lifted (likely bleached).
I scanned it and tried to post it but there was problem posting the image due to some technical glitch. When I get home, I can try again, and if the technical problem is resolved you'll see what I mean. I have found that its actually easier to see where the numbers have been removed when the image is NOT blown up (the removed micro-printing shows up better).
On this $2.00 the microprinting looks fine... only on the one side is there a general erased look...but not as much on the right. Yes, there is some kind of strange orangish printer's ink smear that does seem to appear up on the borders, and a bit of a white blemishes that run veritcally through the note. It is possible that this note had a gentler more refined number removal process.. so hard to say. I find it hard to imagine removing a SN without seriously altering the microprinting. The only explanation (if this was indeed a number removed) is if the original SN was very lightly or poorly applied.
It's a hard call when you can't inspect the note in person. The problem with the no-question asked guarantee is that you've got to pay for the postage, and you may be charged for the $ transaction.
BTW: IMO: this note does NOT look UNC - Check under the "A" for light brown stain