There isn't hard evidence that cell phones and cameras have been looted or deliberately damaged by rebels, Russians, Ukrainians or anyone else.
Rumors that rebels turned the black boxes over to the Russians proved to be false.
It is easy for speculation to be turned into accepted knowledge by repetition.
Flight MH17 Victims' Bodies Were Looted. Or Maybe Not. - Bloomberg View
Distorting the truth is easy, and both sides of the controversy are very skilled at that.
Perverted truth: How rebel mourning MH17 victims was turned into looter with trophy ? RT News
The family of Cameron Dalziel, a British victim of the crash, had to issue a statement through the British Foreign Office denying claims of theft. “We have had no notification that either his credit cards or cell phone have been used. They were cancelled for security reasons only, as you would when any card or cellphone is lost,” his family said.
Awaiting truth and closure - The Hindu
The fact that personal belongings were picked up does not prove intent to steal or destroy.
MH17: Looted belongings returned, says IGP | theSundaily
We can't confirm rumors about looting, but we know the investigators are not fully forthcoming about evidence. In some cases we know what they have but not in detail, like the contents of the cockpit voice recorder and flight data recorder. We learned long after that fact that they have recovered 500 foreign objects embedded in bodies and luggage. Even then we don't know the details. We're told that 5% of the objects contains iron, and we know nothing about 95% of the objects. Investigators knew about a victim found wearing an oxygen mask long before that became public knowledge.
We can't rule out the possibility that the investigators have recovered and are analyzing cell phones and cameras. Maybe some day we will know.