Below is a list of item values for the different versions of Majora's Mask.
NOTE: Anything with an asterisk next to it is either beta, unknown, or leftover from Ocarina of Time.
Majora's Mask (J)
00 = Ocarina of Time 01 = Arrow 02 = Fire Arrow 03 = Ice Arrow 04 = Light Arrow 05 = Fairy Ocarina* 06 = Bomb 07 = Bombchu 08 = Deku Stick 09 = Dku Nuts 0A = Magic Beans 0B = Slingshot 0C = Powder Keg 0D = Pictograph 0E = Lens of Truth 0F = Hookshot 10 = Great Fairy's Sword 11 = OoT Hookshot* 12 = Empty Bottle 13 = Red Potion 14 = Green Potion 15 = Blue Potion 16 = Fairy in Bottle 17 = Deku Princess 18 = Milk 19 = Milk (1/2 Full) 1A = Fish in Bottle 1B = Bugs in Bottle 1C = Blue Fire* 1D = Poe 1E = Big Poe 1F = Water 20 = Spring Water 21 = Zora Egg 22 = Gold Dust 23 = Mushroom 24 = Purple Potion?* 25 = Purple Potion?* 26 = Sea Horse 27 = Chateau Romani 28 = Eel* 29 = Purple Potion?* 2A = Purple Potion?* 2B = Purple Potion?* 2C = Purple Potion?* 2D = Purple Potion?* 2E = Purple Potion?* 2F = Purple Potion?* 30 = Moon's Tear 31 = Clock Town Title Deed 32 = Swamp Title Deed 33 = Snowhead Title Deed 34 = Great Bay Title Deed 35 = Poacher's Saw* 36 = Broken Biggoron's Sword* 37 = Prescription* 38 = Eyeball Frog* 39 = Eye Drops* 3A = Inn Keys 3B = Letter from Mama 3C = Moon's Tear 3D = Moon's Tear 3E = Moon's Tear 3F = Moon's Tear 40 = Moon's Tear 41 = Moon's Tear 42 = Moon's Tear 43 = Moon's Tear 44 = Letter from Kafei 45 = Pendant of Memories 46 = Moon's Tear 47 = Moon's Tear 48 = Moon's Tear 49 = Moon's Tear 4A = Moon's Tear 4B = Moon's Tear 4C = Moon's Tear 4D = Tingle's Map 4E = Deku Mask 4F = Goron Mask 50 = Zora Mask 51 = Fierce Deity Mask 52 = Mask of Truth 53 = Kafei Mask 54 = All-Nite Mask 55 = Bunny Hood 56 = Keaton Mask 57 = Goro Mask 58 = Romani Mask 59 = Circus Leader's Mask 5A = Postman's Mask 5B = Couple's Mask 5C = Great Fairy's Mask 5D = Gibdo Mask 5E = Don Gero's Mask 5F = Kamaro's Mask 60 = Captain's Hat 61 = Stone Mask 62 = Bremen Mask 63 = Blast Mask 64 = Mask of Scents 65 = Giant's Mask 66 = Fire Arrow (Wind Medallion as text) 67 = Ice Arrow (Ice Medallion as text) 68 = Light Arrow (? Medallion as text) 69 = Goron Drums* 6A = Zora Guitar* 6B = Deku Horns* 6C = Kokiri Sword 6D = Razor Sword 6E = Gilded Sword 6F = Double Helix Sword 70 = Hero's Shield 71 = Mirror Shield 72 = MQ-Style Mirror Shield* 73 = Quiver (holds 30) 74 = Quiver (holds 40) 75 = Quiver (holds 50) 76 = Bomb Bag 77 = Bigger Bomb Bag 78 = Biggest Bomb Bag 79 = Strange Wallet* 7A = Adult's Wallet* 7B = Giant's Wallet* 7C = Fishing Pole* 7D = Odolwa's Remains 7E = Goht's Remains 7F = Gyorg's Remains 80 = Twinmold's Remains 81 - FE = Junk Icons (Displays garbled text or dungeon items) FF = Null
Item Modifying Codes for (J) Version
Codes in here by poe7 801EF4F0 00?? = All-Nite Mask 801EF4EA 00?? = Blast Mask 801EF4EF 00?? = Bremen Mask 801EF4E9 00?? = Bunny Hood 801EF4FD 00?? = Captain's Hat 801EF4F5 00?? = Circus Leader's Mask 801EF4F7 00?? = Couple's Mask 801EF4ED 00?? = Deku Mask 801EF4F1 00?? = Don Gero's Mask 801EF4FF 00?? = Fierce Deity's Mask 801EF4FC 00?? = Garo's Mask 801EF4FE 00?? = Giant's Mask 801EF4FB 00?? = Gibdo's Mask 801EF4F3 00?? = Goron's Mask 801EF4EC 00?? = Great Fairy's Mask 801EF4F6 00?? = Kafei's Mask 801EF4FA 00?? = Kamero's Mask 801EF4EE 00?? = Keaton's Mask 801EF4F8 00?? = Mask of Truth 801EF4E8 00?? = Postman's Hat 801EF4F4 00?? = Romani Mask 801EF4F2 00?? = Mask of Scents 801EF4EB 00?? = Stone Mask 801EF4F9 00?? = Zora Mask 801EF4CD 00?? = Sword And Shield slot 811EF51A 20?? = Quiver and Bomb Bag slot 801EF51D 00?? = Bomber's Notebook and Song of Storms slot 811EF51E F7?? = Rest of the Song slots and the Remains slots 801EF4D5 00?? = Event Slot 1 801EF4DB 00?? = Event Slot 2 801EF4E1 00?? = Event Slot 3
More Codes Later
There are few exceptions for the values, such as on the equipment upgrades, where there are different outcomes.