All excellent points. The fact that this initial apparent fabrication about the "malleability bug" has been allowed to stand, more or less completely unchallenged for six months, when provably false has raised some doubts about the true nature of the "investigation".
The police will only investigate if someone makes a concrete accusation of a crime. Clients would be hard-pressed do it while they don't even know whether the coins were really stolen (perhaps they never existed?) or when they were stolen.
My understanding is that the Japanese police was asked to start a criminal investigation only recently, at the request of Mr. Kobayashi, and for only a small part of the missing BTC (less than 30'000). I imagine that he already found clear evidence of such a theft, but there may be more in the future.
I don't know of any other police investigation before that.
I found this in an article dated
April 16, 2014:
It's probably safe to say that the Tokyo police were called in to investigate at a very early stage after the collapse. Why they waited until the end of July to declare it an "official" investigation is hard to say. Perhaps Kobayashi had something to do with it, but more than likely, it was merely done for some bureaucratic convenience.
The fact that they are investigating such a relatively small number (27,000) of the alleged 650,000 missing, may be an indication that Mt. Gox never held much more than those 200,000 found in the old-format wallet. The 650,000 number missing could have been a gross exaggeration due to either unintentional double counting or else possibly even intended deception by some parties unknown.
Mark Karpeles stated in a late June
Wall Street Journal interview that "he doesn't believe more [than 200,000 coins] will be found." He sounded pretty sure. This might even explain Karpeles' seemingly blase attitude about the matter as displayed by his recent postings on reddit and twitter. Perhaps in his view, the case is solved. The bitcoins have been found, and now it is up to Kobayashi to take care of returning them to their rightful owners.
The endless delays and obfuscation in the bankruptcy proceeding could result from a blame game in which the responsibility for the mess gets shifted from one party to the next--in effect, a political hot potato.
If the true cause of the closure was a freeze up of funds at Mt. Gox's banks and not missing bitcoins, it could well explain why there has been a reluctance to date to come forward with any explanation.