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NO, there is no proof of any itens are removed from the rewards pool. Fansites can select prizes that will be offered later in the contest, In certain cases, a fansite submits a prize proposal, but it is eventually adjusted by Cipsoft members for various reasons. Therefore, the prizes are not always entirely defined by the fansite, and occasionally, along with rare and valuable items, other less unique and interesting items from the participants' point of view appear. Some of de side rewards allowed to given in a pool prize: (Tibia.Fandom.com)

• Fansite Items
• Baby Seal Doll
• 3 Bast Skirts
• Demonic Essences
• Dream Matter
• Frozen Starlight
• All Goblets
• Golden Figurine
• Gold Ingot
• Infernal Bolts
• Jewel Case
• Mini Mummy
• Panda Teddy
• Rat God Doll
• Roshamuul Prison Keys
• All Rune Emblems (golden and silver)
• 10 Skill Potions
• Stuffed Dragon
• Stuffed Toad
• Teddy Bear
• Green Tome
• Blue Tome
• Vampire Doll
• Wooden Whistle
• Yellow Rose
• Almost all trophies (including Snake God Trophy)
• Some amulets and necklaces (including Bronze Necklace)
• Some rings
• The following taming items: Bag of Apple Slices, Bamboo Leaves, Carrot on a Stick, Decorative Ribbon, Fist on a Stick, Foxtail, Giant Shrimp, Golden Can of Oil, Golden Fir Cone, Harness, Hunting Horn, Leather Whip, Maxilla Maximus, Reins, Slug Drug, Sweet Smelling Bait and Tin Key.
• The following addon items: Dragon Claw, 15 Magic Sulphur, Mandrake, Nose Ring, 50 Red Pieces of Cloth, Sniper Gloves, Soul Stone, Spool of Yarn.
• All Pirate Bosses' addon items (Ron the Ripper's Sabre, Deadeye Devious' Eye Patch, Lethal Lissy's Shirt, Brutus Bloodbeard's Hat) as one prize.

Note (1): Arcane Insignia, CM Token, Council Certificate, Laurel Wreath and The Famous Golden Bug can only be given out by CipSoft. 

Fansite Itens:
There is only one item (Scroll of the Stolen Moment) you can't earn or buy-it, even the replica version, because was removed from the fansite program before the item was implemented in-game.

Many of the items that once existed in Tibia as a reward for winning a fan-site competition are no longer rewards because the promoted sites are no longer part of the CipSoft program and since they are items from events promoted by them, they can no longer be distributed as prizes. All existing or ever-existing Contest Prizes items can be seen at The Tibian Prize Exhibition, located ,underground near Thais' Games Hall (here) for a fee of 50gps. (prize show on Sundays).

You can buy replica fan-site items from NPC Jorge, at Adventures' Guild for 20 Silver Raid Tokens Tokens even if they are no longer part of the CipSoft fansite program. Remember that they are just replicas of the original items. Tibia has a fansite program that has some agreements, both for Supported and Promoted Tibia Fansites. Sites that fail to comply with some regulations, were later demoted due to some irregularity, did not follow the rules, want to stop being official partners or are in some way analyzed as a scam, are discontinued.

All existing or ever-existing items (official or replicas) can be seen by clicking HERE. Or you can check out in the image below: (FanSites Itens)

Note (2): 20th Anniversary of the Fansite Programme: 

To celebrate the 20th Anniversary of the Fansite Programme, CipSoft will be holding a Nostalgia Raffle for items that have been discontinued and are no longer part of the promoted fansites. (some of the old ex-fansites itens now can be acquired by lottery).