More than 1.2 million cigarettes have been seized by customs officers at Dublin Port.
The haul of "'Palace" brand cigarettes, which were contained in a number of pallets described as general cargo, had arrived on a ferry from Belgium.
Officers from Revenue's Customs Service believe the seizure has a retail value of 552,000 euro and a potential loss to the exchequer of 326, 290 euro
A spokeswoman said the seizure is part of Revenue's ongoing operations targeting the supply and sale of illegal cigarettes in the shadow economy.
"If businesses or members ofds of the deceased in the pub," he said.
Senior sources said detectives have established a motive for the gun attack on the father-of-one and are focused on a prime suspect from the locality.
"We know who he is, we just need to get him in," he said.
The victim was known to gardai and was previously connected with a gang run by murdered gangland boss Eamon Dunne, known as The Don, who was shot dead in the nearby Fassaugh House Pub in April 2010.
Detectives have trawled through CCTV from in and around the bar to piece together the movements of the gunman and motorbike used as the getaway vehicle.
No arrests have been made to date and no handgun recovered. A cash reward is being offered to anyone who calls Crimestoppers on 1800 25 00 25 with information which significantly helps the investigation.