I have this same concern. Currently reaching out to Eliante to see if he knows where the "five" originated.
That said, I do consider the coin an interesting anomaly. How many have surfaced now? Just two?
I have been reached!
The information was posted on the Casascius blog, though I have been unable to relocate the information (It is still probably there, though).
Luckily, I do have a saved image that used to be in his blog (image search does not find it posted anywhere else, though..).
I believe that this image is sufficient evidence to declare that 5 of these coins exist.
We do not know the specific first-bits of the coins. at this point, I am aware of two.
Of the remaining three, it is entirely possible (indeed, likely due to the redemption rate) that at least one has been redeemed.