Should I be concerned

[LazyMemories]

Copy pasted from the mogstation:

Information about Optional Items
Item Delivery

Optional items will be delivered to all characters designated at the time of purchase via the moogle delivery service.

If you find your items have not been delivered, please try the following:
* Please delete any unwanted letters from your mailbox. Your mailbox can only store a maximum of twenty letters with gift, bonus, or optional items enclosed ().
* Select the Reward Delivery Request button.

Delivery will automatically be reattempted after space has been freed by deleting old letters. Timing will vary as follows:
* Within 10 days of purchase: Up to one hour may be required for re-delivery.
* More than 10 days since purchase: Up to 24 hours may be required for re-delivery.

Thank you for the reply i'll check how much space