These are all of the items and their effects that Riot has either removed or didn't release besides the 4 that we have in the Wiki-wordmark.

Bag of Tea: Click to Consume: Restores 400 health and 200 mana over 10 seconds. Bag of Tea can only be consumed after scoring the killing blow on a Champion.

Renewal Shell: +24 Armor +10 Health Regen per 5 sec UNIQUE Passive: On being hit, restores 20 Health over 5 seconds, does not stack.

Mana Battery: +300 Health +25 Ability Power UNIQUE Passive: 20% chance on Physical Attack for your next damaging spell to gain +100 Ability Power.

Pendant of Zephiris: UNIQUE Aura: +25 Armor / +30 Magic Resistance to nearby allies.

Wizard's Regalia: +50 Ability Power +60 Armor UNIQUE Passive: Chance on hit to temporarily increase Ability Power and Armor by 10. This effect can stack up to 5 times.

Gouging Blade: +25% Attack Speed +25 Health Regeneration per 5 UNIQUE Passive: Chance on hit, to apply a minor damage over time ability that deals 10 damage per second for 10 seconds, during which the target cannot regenerate their health.

Boots of Mobility: UNIQUE Passive: Enhanced Movement 4. Passive: While your champion is in combat, the effect of these boots are diminished to Enhanced Movement 2.

Blink Dagger: Unique Active: Teleports your champion to a target location once every 2 minutes. Any damage taken during the cast time will interrupt the cast.

Mournblade: +15% Lifesteal Passive: Restores 50 Health after killing a unit.

Oponn's Razor: +15% Lifesteal +40% Attack Speed Unique Passive: 30% chance on hit to proc a debuff that increases the damage received from enemy champion attacks by 8 Magic Damage for 8 seconds. This effect stacks to a maximum of 6.

Rejuvenation Potion: Click to Consume: Restores 150 Health and 75 Mana over 15 seconds.

Parasitic Recurve Bow: +10% Lifesteal +40% Attack Speed Passive: 5% Mana Leech.

It is likely that many of these items were reworked into the items we have in the game today.