The 31-year-old scrum-half has been dueling with Eoin Reddan for the No9 shirt at the RDS, meaning game time has been shared between the two, but Boss has been delighted with the outcome of his move to Dublin.
"I love it every day, getting out there and getting paid to do what I love," Boss told the Irish Independent.
"My only regret is that I didn't come earlier. I actually had the opportunity to come to Leinster when Matt Williams was there in 2003/04, but at the time I still had a couple of things to do on my degree (in management studies) and I thought I'd get that behind me first.
"Maybe I should have come to Leinster and burst onto the Irish scene and it could have been different. But hopefully I've got a few more years left in me yet."
Leinster take on Northampton in the Heineken Cup Final this Saturday before facing Munster in the Magners League Grand Final a week later.
But while success on the club scene is just a stone's throw away, things are a little less advanced on the international stage.
Capped 13 times by his adopted country, the New Zealander is an outsider for World Cup selection in the land of his birth this autumn.
Boss last played for Ireland against Samoa in November and was overlooked for the 2011 RBS 6 Nations campaign.
And with Reddan, Peter Stringer, Tomas O'Leary and Connor Murray all in the running for an Ireland spot, Boss believes he needs two big performances if he sees action this weekend and next to boost his chances of an international recall.
"The next few weeks are important - if I can get game time in these big matches and play well in them maybe it will prove something and that won't go amiss," added Boss.
"I'm really disappointed that I'm not in that frame with the Irish team. But that's just the way it goes. All I can do is try and change the man's (Ireland coach Declan Kidney) opinion with on-the-field tactics.
"You don't really know what they're thinking so we'll just have to wait and see. Every player has a different sort of approach but I've always found it tough talking to coaches and saying what you want to say. I always think your actions have got to speak louder than your words.
"I hope that ship hasn't sailed but it does get demoralising after a while. But the day to day is still my core and I thoroughly enjoy playing for Leinster."
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