So can we agree there are grounds to think the letter is, at the very least, suspect?
How can we determine if letters in general are genuine in such situations?
And if we can't make a clear determination, doesn't it call into question ALL such letters?
I think it's a very stupid move, whoever would do this.
Yet the impulse to forgery has a long and tenacious history in all human affairs. Some people create forgeries for no greater reason than the satisfaction of pulling it off. They can be the most difficult to identify because they have no obvious agenda or motive.