Great Stuff from Gachapon!

how are you sure they cant? iirc, some people said they could get a ring on kMS, and since gMS just copypaste the data, maybe they can.

I think the quest extension was done manually. This is what the original quest is like:

 The Hard Fought level 50 Challenge!

Requirements and Items Needed:
On Beginning:
Quest Available Until: 14.07.2010 00:00
Item #0: Explorer's Cruel Ring (ID: 1112427)
Item #1: Explorer's Critical Ring (ID: 1112428)
Item #2: Explorer's Magical Ring (ID: 1112429)
Job Required: Beginner
Job Required: Warrior
Job Required: Dark Knight
Job Required: Magician
Job Required: F\P Wizard
Job Required: I\L Wizard
Job Required: Cleric
Job Required: F\P Mage
Job Required: I\L Mage
Job Required: Priest
Job Required: F\P Arch Mage
Job Required: I\L Arch Mage
Job Required: Fighter
Job Required: Bishop
Job Required: Bowman
Job Required: Hunter
Job Required: Crossbow Man
Job Required: Ranger
Job Required: Sniper
Job Required: Bow Master
Job Required: Marksman
Job Required: Thief
Job Required: Assassin
Job Required: Page
Job Required: Bandit
Job Required: Hermit
Job Required: Chief Bandit
Job Required: Night Lord
Job Required: Shadower
Job Required: Pirate
Job Required: Brawler
Job Required: Gunslinger
Job Required: Marauder
Job Required: Outlaw
Job Required: Spearman
Job Required: Buccaneer
Job Required: Corsair
Job Required: Crusader
Job Required: White Knight
Job Required: Dragon Knight
Job Required: Hero
Job Required: Paladin
Must Be Under Level 50
Level Required: 40
The Npc Starting the Quest: Cassandra (ID: 9010010)
Requires Quest Explorer Lv. 40 Challenge (ID: 10573) Completed
On Ending:
Item #0: Explorer's Cruel Ring (ID: 1112427)
Item #1: Explorer's Critical Ring (ID: 1112428)
Item #2: Explorer's Magical Ring (ID: 1112429)
Level Required: 50
The Npc Ending the Quest: Cassandra (ID: 9010010)

As Cyanne stated, they simply extended the ending time for this quest, which means...