No, it's not possible for fiat to disappear afaik. Unless it
never existed in the first place.
Rewind the scenario that happened;
- Mt.Gox inflated the price using non'existant fiat funds aka - Willy bot.
- people who sold bitcoins were then trying to cash fiat out of the exchange
- the exchange couldn't pay everyone their fiat balance, since there was not enough money, they were insolvent
*How they additionally managed to loose
BTC as well is beyond me, i guess they are advanced in stupidity.
There was previously a case in btc-e.com , where attacker managed to fake deposits credited via Liberty reserve payment processor, then proceeded to buy btc & ltc and withdraw them,
luckily, their actions were noticed early on, and the exchange was able to roll back every trade after the attack, and pay up the damage done.
Whether or not Mt.Gox case had a similar attack, or was it indeed inside job (many will argue that Karpeles himself orchestrated this) i really can only guess, like everyone else.
How is this possible? Could a business really "misplace" fiat in a way that doesn't leave a trail?
So its a year old news and people realized that now ( or it has been discussed before?) . Everything with the company is pretty shady to begin with. Regarding the FIAT that was left untraceable, there isnt anything sort like that because it is indeed an inside job meant to steal and keep it hidden for some reason
Banking system allows the bank to locate any FIAT transaction made from a bank account to another bank account which means that all of this transaction should be listed in a database otherwise the bank is the "stealer" themselves. It is pretty much easy to locate a 2.8 billion yen even though if you split them up to hundreds bank accounts in a smaller increments. It is definitely funny if no one knows the existence of this FIAT
P.S : if you left the BTC part as well as the company and just focusing on how FIAT dissapear then this suited in this sectionI have striked out tiny parts of your reply that don't answer the quoted question. You're welcome.
cheers