Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
Have you tested the batteries elsewhere to check if they are working correctly, or tried testing them with a voltmeter?
Do you have any other fresh AAA batteries that you can try?
Are there any lights or beeps when using the AAA batteries?
Are you using 4 x AAA alkaline batteries?
(rechargeable or non-alkaline batteries should not be used)
Ok, then there is a fault with the keypad.
Since the safe is new, you should return it under warranty.
Is there anything else I can help you with today?
Ok, well I am glad I could at least help confirm what you had already suspected.