A 'tiger' kidnapping suspect was linked to the crime when he bought milk for a baby being held hostage, gardai have alleged.
The prosecution against Jonathan Gill (32) maintains the kidnappers failed to destroy the empty carton when they burned out the car used in the abduction.
It is alleged that they stole nearly €662,000 in the 2011 raid.
Cloverhill District Court heard that the 10-week-old girl and her mother were imprisoned in the car and the baby – who had not been fed for some eight to 10 hours – became "extremely distressed".
It was alleged at the bail hearing that "sophisticated surveillance equipment" was set up on the roof of the Drogheda post office by the raiders before the robbery.
Gill was granted bail subject to strict conditions following the hearing. It was his second court appearance on false imprisonment and robbery charges following his arrest last week. Judge Grainne Malone remanded him in custody, with consent to bail for two weeks for the preparation of a book of evidence.
Gill, a father-of-two, is charged with falsely imprisoning post office worker Warren Nawn (37), his partner Jean Marie Matthews (36) and their 10-week-old baby daughter Ella in Drogheda between August 1 and 2, 2011.
He is also charged with stealing cash from a post office in Drogheda on August 2.
Defence solicitor Michael Finucane told the court he was applying for bail. Objecting, Sergeant Fearghal O'Toole cited the seriousness of the allegations.
Outlining the allegations, he said the family had been at home when Mr Nawn answered a call to the door. He was forced back in by three raiders.
Mr Nawn and Ms Matthews had their legs and arms tied and duct tape was put over their mouths. This was removed while they were "interrogated", Sgt O'Toole said. In the early hours of the morning, Mr Nawn was placed in the boot of his car and his partner and baby were put in a different car. They were driven to another location in Swords, Co Dublin, and were left there for the night, tied up.
The baby went without being fed for eight to 10 hours and became "extremely distressed", Sgt O'Toole said.
Mr Nawn was ordered to go to work and take the money from a cash delivery at the post office. While he took €661,125, his partner and child were removed to another location in Mulhuddart where one of Ms Matthews' arms was tied to a steel bed while her other arm was freed to hold her baby.
Mr Nawn delivered the money to the raiders, who fled.
It was alleged that arrangements had to be made to feed the baby who was "literally starving" and there was CCTV evidence of Gill buying milk at a shop. The car was burned out but was not completely destroyed and gardai recovered a milk carton which was allegedly from a batch that had been delivered to the shop.
Mr Finucane said the defendant had been arrested and questioned in 2012 for two days and released without charge.
The accused was currently unemployed but had formerly been self-employed, running a number of businesses including a cafe and used car dealership.
Judge Malone granted bail in the defendant's own bond of €5,000, with an independent surety of €45,000; of which €15,000 is to be lodged.
She also ordered a second surety of €15,000, with €5,000 to be lodged.
Conditions are that Gill surrenders his passport, stays out of Co Louth except for specified dates, signs on twice daily at a Dublin garda station and observes a curfew.