There was no sign of a struggle or blood found in the car used by two Dublin men missing since Tuesday, according to gardaí.
Detectives believe a criminal gang may have been involved in the disappearance of Anthony Keegan and Eoin O'Connor.
The focus of the search for the men has switched back to Cavan.
There was no garda activity at Lough Owel in Co Westmeath today, where a car in which the men had travelled to Cavan was found.
The car was taken from Lough Owel to Santry Garda Station in Dublin where it was examined.
Gardaí hoped it might give some clues as to what happened to the men since they were last seen.
Mr O'Connor, 32, and Mr Keegan, 33, were reported missing at Mountjoy and Santry Garda Stations by their families.
Mr O'Connor is described as being 1.83m (6') tall, of stocky build with short brown hair and blue eyes.
When last seen he was wearing grey tracksuit bottoms and a blue windbreaker-type jacket with a hood.
Mr Keegan is described as being 1.78m (5'10'') tall, of medium build with short brown hair and brown eyes.