There were no marks indicating a forcible opening of doors of the Scorpio which was found with explosives near industrialist Mukesh Ambani's house last month, a senior police official said here on Friday.
This led the investigators of Mumbai Crime Branch to suspect that it may have been opened with a duplicate key when it was stolen, he said.
The case has been now taken over by the National Investigation Agency (NIA).
Mansukh Hiren, in whose possession the SUV was, had claimed that it was stolen from Vikhroli area a week before it was found outside Ambani's house. Hiren was found dead in mysterious circumstances on March 5.
"We did not find any marks suggesting that the doors were opened using force," said the official who was part of the crime branch probe team.
But the forensic lab report of the vehicle was awaited, he added.
Hiren had said he had left it on the road as its steering got jammed on the night of February 17.
Meanwhile, on Friday an NIA team visited Thane police officials to get information related to the case, sources said.
The Maharashtra ATS, which is probing Hiren's death, also recorded some persons' statements in Thane, sources added.
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