I hope this is not an attempt to strong arm a casino into making payments to you. That's a good way to jeopardize your forum account.
People make mistakes - deal with it. You weren't properly notified - that's their mistake. You didn't take note of your balance, that's your mistake.
If someone steps on your foot, are they supposed to buy you new shoes or just say "I'm sorry"?
It's all very well, but surely the PLAYER also has the expectation that "saying sorry" for their mistake will be enough, yet the casino says it is not, and has decided to void the tournament winnings as well.
Whilst the player logged out, and hours later logged in with a hogher balance, can the casino rightfully ASSUME that the player has a perfect memory of their balance when they logged out, and thus INSTANTLY knew that it had increased later that day from a cause other than a deposit.
It seems it was the players caution in trying to keep clear of such situations that CREATED this situation in the first place, since it was the act of playing down a balance to zero that CAUSED a free chip to arrive between sessions.
Maybe a 50/50 split would be a resolution, with each side having made an error, each should bear half the burden. The win should be halved to $650, with each side thus paying a "fine" of $650 to the other for their error. This assumes both sides acted in good faith, and neither tried to "pull a fast one" because of this system error.
Unlike MGS, RTG software does NOT show players the difference between bonus balances and cash balances. This could NOT have happened in an MGS casino, whether or not an email had been sent or read by the player, and whatever the player did or did not remember from their earlier session. The MGS software would block the purchase of the tournament entry, and instead direct the player to banking in order to make up the CASH balance with a further deposit.
Even if a player wanted to, there is little help in the BASIC information that a player can access about their account, and even OPERATORS seem to have to "go to RTG" to gain access to such information. MGS players can access ALL such information in Cashcheck and Playcheck, and to a considerable degree of detail.