Hi BakedPotato1,
When you choose the eCheque payment method this is not instant and it takes between 3-5 days for PayPal to process your eCheque. After this time your Booster Packs will become available in-game automatically like normal.
If you chose this payment method by mistake, please let us know and we can cancel this purchase for you and no funds will be taken from your account.
Hope that helps!