First, allow me to apologize for bringing this up so long after the game and e-guide have come out.
As I have begun playing WMA again after a long time I've actually started to notice that there are a few new items in WMA that aren't covered in the e-guide's updated section on the new content.
A few examples of this would be the Bonfire item and the unique sword that

(Mysterious Girl) wields in stage 1-4. These wonderful items have good confine rates (+15% HP, +15% ATK, +10% DEF, +20% RES) and a STEAL stat of 15. Thus Walnut would have to be level 9-10 to steal a level 1 Bonfire every time (and the Bottlemail would have to be level 1 to obtain it).
This sword, referred to as the "Sunflower Sword" in the e-guide is called "Hell Ansas" in the game (North American version) and "Sunflower Sword" is simply the category of weapon.
I would also like to note that unless the player has a Bottle Mail (impossible unless you obtain the one from jump height on Phantom Island) you would need Walnut to be approximately level 32 to have a 100% Take Back (steal) rate when confined on the sword itself. If you do by chance get a Bottlemail it would need to be level 14 to have a 100% Take Back rate when confined.
I hope this helps anyone who was curious about these and other (haven't gone to far yet) possible items that didn't make it into the e-guide.