Hi there. I’m planning to buy the Reset Pack but I’m on vacation right now and it says the reset pack will be removed later on (Also heard you can get it through mission later maybe). The thing I’m wondering is if I buy it now and come online after maybe three weeks will I still be able to redeem it ?
You should be able to buy the DLC now and redeem it later. Just at a future date the Reset pack will be removed from purchasing. 
Yup, i remember when i got mine.
It arrives on the team lodge mailbox and has unexpirable tag, so you can pick it up whenever.
Edit: Also i believe the Rank Reset was able to put on team storage and won’t expire aswell.