There are Items that you cannot find or pick up, like the ones that have the icon of a Key. You need them to forge items like the Night Lotus (Shield) - Onion Sword - Moogle Staff - Chocobo Hammer - etc... Well below are the values to all of these key items, Took a while to find them but here you are, Enjoy
Setting below Items to 61 value when editing them will give you 97 items.
Light Cristal - 0825BFC6
Gold Choco Feather - 0825BFC7
Stiltzskin's Diary - 0825BFC8
Soldier Pride - 0825BFC9
Dragoon Lore - 0825BFCA
Mark of Destiny - 0825BFCB
Jenova Cells - 0825BFCC
Phantoma - 0825BFCD
Saviour's Wish - 0825BFCE
Model Gun - 0825BFCF
Ruined Relic - 0825BFD0
Toolbox - 0825BFD1
Setting below Items to 61 value when editing them will give you 97 items.
Light Cristal - 0825BFC6
Gold Choco Feather - 0825BFC7
Stiltzskin's Diary - 0825BFC8
Soldier Pride - 0825BFC9
Dragoon Lore - 0825BFCA
Mark of Destiny - 0825BFCB
Jenova Cells - 0825BFCC
Phantoma - 0825BFCD
Saviour's Wish - 0825BFCE
Model Gun - 0825BFCF
Ruined Relic - 0825BFD0
Toolbox - 0825BFD1