Do you remember the Argentone papers ?

I thought Argentone papers are gone, but a few days ago they showed up again in Japan.
First thing I thought was that the dealer in Japan had stocks(that also I heard weeks earlier), but the package which my friend got today said its expired date is 10/2015.
A package I bought lately has expired date 07/2011.

Do you have any informations ?
Are they still in production ?

I liked Argentone papers very much. They are really nice.
I hope they are back actually, but it seems to be too good to be true...

Any ideas ?