I don't think that should be loose. I'd take it in to the dealership on your next visit and have them look at it. I have a broken tab on the middle seat cup holder that they will replace next service visit. They've been real good about quality issues.
Infiniti is usually great about fixing those sorts of things under warranty. Just ask your service adviser and they should be able to help. I've seen us replace entire dashboards, leather seats, etc. - just because of cosmetic flaws.