you could try some charities, they usually have counting machines, they may charge you a little for the priviledge, otherwise just donate the lot to a charity of your choice!
The most efficient is to use one of those machines. Don't they charge a % of the amount, so with coppers, the commission you pay will be small compared to the amount of time that you would spend counting coins of little value.
It would take forever just putting a euro's worth in. I have tried it and it would drive you mad as they keep dropping down through the slot. It's fine a few cents worth but that's about it.
I've seen a similar machine in Dunnes in Kilnamanagh Shopping Centre as well. Have you thought about giving them to a local charity such as the Vincent De Paul? I'm sure they'd gladly take it off your hands