Wait where is this NPC? So say you have 10 days VIP, every day you can redeem for 10 tokens, is this correct?
Main room of eden 1st floor, above the entrance to the kitchen. And yep, as long as your vip is active you can cap your token up to 10. So, say you have 9 left and cooldown is up, it will give you 1 to cap back to 10. If you had 3 left it will give you 7, making your total 10.
So you can't just claim 10 per day and have hundreds stacked up over time.