Builder Got $4000000 in 24 hours! NO JOBS

I have a build on my server that in the past 24 hours got $4000000! WTF!
The builder has no jobs. He bought a few houses then decided to destroy them.(waste of time)
Does ANYONE know how he did this???!?!?!?

 

Check your server log, for anything obvious, Then after that, I would suggest that he used an X-ray mod to go mine diamonds and sell them

 

possible, but diamond blocks are only $500 in the shop
that would take FOREVER! whereas he did it in about 2 hours

 

@hunterboerner
Check your log to see if any of your staff gave him free money.

 

none of my staff are on at 1 in the morning

what i find stupid is that he griefed a place he OWNED therefore he griefed himself

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Is he a regular player, or a new player? If he is a new player, you can check to see if any mcbans servers have banned him here:

http://mcbans.com/player/usernamehere

Just replace usernamehere with his MC username

 

nothing on there about him

username is:
MiAsMiCx

 

Maybe some kind a dupe bug he used?

 

there are hax to do this.
read your command history.
he probbebly has used an moneykeygen

 

is there a plugin to stop it

 

youd have to use the hack and find out what your economy plugin does,
and the try to disable it

http://lmgtfy.com/?q=minecraft+iconomy+hack