I don't believe the "debunking." Why would the triangles be black and then colored in white, including the text of the stamp? I don't see how that would happen in any kind of "outlining algorithm." Nothing else on the envelope was outlined. I haven't see anything proving the actual envelopes had black triangles instead of white.

So I see it as a stupid photoshop mistake, just as there were stupid mistakes made on the Obama birth certificate.