That is almost the same problem as having to prove one has been robbed at a solitary place. The police would have to look for a fishy-looking transaction, and see if there were indicators that the machine were bitcoins resided was hacked.

Yeah, there would be slim chances of recovering the stolen money, but that already is the case with cash, given a smart enough robber. The right way to tackle that problem is not to make the stolen goods easy to track, but to have preventive measures. In Bitcoin's case, these measures would be good security practices.