Generic great item-givers

There are a few generic great item-givers. These all have pools with identical items.

The generic great item-givers are:
 * Sealed Containers
 * The Greater The Risk in Yello World
 * Pacman
 * Pandora's Box
 * Explorer's Backpack

As of May 3rd, 2021, all of the items in the pool are:
 * All Sealed Containers, all "identified" Loot Crates, ACME TNT, BFG 9000, Bulging Deck, Butter Bot, Cooking Supplies, Dark Scroll: Death, Darth Revan's Mask, Defective Turret, Dino Egg, Downie's Gift, Dys Action Figure, Fighter's Gi, Freeze Ray, Frostfire Figurine, Genetic Resequencer, Glitcho Glasses, Go-Kart, Goldfish, Heart Of The BGO Slut, Holly's Thicc Booty, Holy Hand Grenade, Hypno Glasses, Improbability Device, Light Scroll: Life Shield, Lilith's Staff, Magic Star, Marieke Doll, Nuclear Reactor, Phaser, Plush Downie, Pose Master's Mirror, Radio, RC Attack Helicopter, Satchel Of The Citadel, Spider Mine, Stress Ball, Tesseract, The Avaril, Tiara Of Transcendence, Tome Of Magic, Vendroid, Wolf.