Keep doing random quests and one will randomly drop. Do stuff in the associate tier since you use less exp.
(this may not work as described - I did 400 exp worth associate tier jobs and got absolutely nothing Irish out of it...)
- i just dropped the Green Fireworks doing a New York job, i was not on the associate tier as i need the untraceable cell phones as well...
I spent about 300/400 energy on the "Rob an Electronics Store" job in the enforcer tier and it dropped. It must just be like a 5% chance of drop or something ****