Looks like the Miller man doth have a sense of humour!.
Someone else agrees with your perception/suspicion. Here is a response to the article:
V
And here's another one who also caught us out (hey, I've been dying to use that Mona Lisa image for months!):-
> Dear Mr. Miller,
>
> Your article entitled, "The Secret of Roswell" concerning
> deliberately mis-filed documents was most interesting.
>
> However, there are at least two things in the article which
> make it appear to be a "spoof" or a joke.
>
> The first is that the article is dated April 1, 2005
> (April Fool's Day) and then there is the picture of an
> alien-looking Mona Lisa, which seems to have no relation
> to the article.
>
> Perhaps this article is meant as sophisticated humor.
>
> But, if you really did receive a package of information,
> then I suggest you change the date on the article and
> remove the "Mona Lisa" photo.
>
> Best regards,
>
> (Mr.) Christen Warwick
> Eastern Arizona, USA
Or just go to the main page and click on "The Secret of Roswell." I almost fell for it, unless he's using some sort of double reverse April fooling, where he's telling the truth!
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