The 1.5kg of herbal cannabis, ketamine, heroin, meth, MDMA and crack cocaine were discovered in parcels from the UK, US and Spain by a sniffer dog called Bailey.
The packages had been declared as t-shirts, phone cases and bicycle gloves.
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Bailey, the sniffier dog involved in the discovery.
They were due to be delivered to Dublin, Galway, Sligo, Kilkenny, Louth, Meath, Wicklow and Kildare.
Revenue have said that investigations are ongoing.
