From your last post, do you know what interview it was where they said Alfons was essentially supposed to be Alphonse but older? Sorry for the trouble!!
yes!! this was just in the mini book that comes with the limited edition of the movie.
This is an English translation of the narration from Roy's perspective after Ed disappears at the end of 03. This was featured in one of the bonus DVD's, "Tales of Another もうひとつの物語" which featured special content from Hagaren Festival 2004.
The same quote is shown in this official art for Conqueror of Shamballa.