Apart from my concern in learning that you're running a Paladin DMPC*, I think you may find that a flying carpet is actually quite powerful and unbalanced at the party's current level (Level 2, as I understand it).
You're essentially giving the character permanent flight, including the ability to hover without any Fly checks. Consider that he can't even cast the Fly spell for temporary flight (minutes per level) until Level 6, and would have to choose that spell as his only 3rd level spell known at that stage.
I think the other PCs would be rightfully annoyed to have one character receive such a significant boon based solely on GM error and player/character selfishness (especially if, as Gulthor notes, from a plot perspective the owner of the Silver Disk would never let him walk away with the money so easily).
While I understand your reluctance to have to correct your error to the detriment of that particular character, I think a DM's role involves ensuring a level of balance and consistency across the game. Preventing one character from having an OP benefit isn't being mean or unfair -- instead, you're acting in the best interests of the entire group and game to balance things out.
Plus, as many others have said, this is a ripe opportunity to flesh out the story, which it sounds like your sorcerer character will probably enjoy.
*: This is an issue outside the scope of what you've asked about, but DMPCs can pose a lot of problems on their own, and having a DMPC Paladin could be especially problematic because of the alignment and morality factors it imposes (which I think are usually fine when it is another player, but risk becoming antagonistic if it is the DM's pet PC who is raising uncomfortable questions or attempting to steer the group's moral compass).
Thanks for your advice,
I dont play lawful stupid paladins I have him as more of a healbot with an emphasis on lay on hands since we only have a cleric every other week. and he can absorb some damage if needed in a fight.
as for the paladin I play him like my own faith I set an example of how my god commands me to live and act but don't expect other players to even have the same world view or morality as me. I wont allow them to be evil but I also allow them to make there own choices and suffer the consequences. its funny actually one player has played before and he is all super scared of my paladin because he is a human lie detector and he can read your mind!!!(not true but the party believes it ha) and for when i now as a dm the party is going to do something my pally wouldn't approve of he happens to leave the room or not be around.
in the prevoous scenario of the Sorc trying to steal konnor baine my paladin offered his sword in finding his parents and offered him another solution instead of pulling his sword and threatening people.