That's all pretty confusing. Katz claims to be robbed out of BTC, while police say his case is not bitcoin-related (?).
Katz lost the following, in addition to getting stabbed:
1. Bitcoin worth some $8,500
2. Fiat cash in US Dollar worth some $3,500
3. His new Samsung mobile phone
4. His credit cards.
As we can see here, the most valuable item was the Bitcoins. Can't understand why the cops announced that his case was not "bitcoin-related".
It probably was not Bitcoin related in the sense that they were not specifically out to acquire Bitcoins. I am sure they exchanged them for cash at the first chance they got so it was more of a crime about acquiring fiat. They could have held up someone selling PM's, or an expensive watch, etc. and the crime wouldn't be a watch related crime, it is just a robbery of items of value that can be easily converted into cash.