future fin box repair

Just picked this board up and noticed that the fin box has been damaged. Its as if they were very abrasive when removing the fin and ended up pushing the back of the box into the foam cracking the glass and separating it. I do not want to "fill in" the gap. what is the best way of doing this repair at home? I have glass and what not but should removing the whole fin box from the board be an option? Help me out, Id love to surf this board in two days.......