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MWJust look to see if part of the "E" is erased. If it is, chances are the "E" was already there.
No offense to TBob, but I find it very difficult to believe that SGC put the "E" on the card. Is it possible that the card was accidentally pressed against a surface that had been written on sometime during submission or when the invoice was being filled out? The reason I'm thinking this is because the number "3" may have been written on the invoice or elsewhere. Just an idea.