Which matters more? The facts or the ysis?

Today, my daughter accused my stepson of taking a crayon and sticking it in her ipod headphone jack. She said she did not see him do this but she he was the only person home beside the adults. For some reason, she did not tell me nor her stepday. My belief is because she thought nothing was wrong with it, but she just didn't. She took the ipod over her grandmother's house and left it there for almost a month. The charger was at home. This past weekend I sent the charge with her during her visit so that she could charge the ipod. She says that now it won't charge because of the crayon. I told my husband and he talked to my stepson about the ipod. Step-son totally denies it; but this is not the first time he has denied something to avoid discipline. So.... the problem is that it didn't happen recently, but damage was done and he was the only other child in the house. We haven't had any children visitors. My husband said maybe crayon got in it while in the backpack, but jordyn says she found the crayon stuck in the ipod earphone jack. She just pulled it out and didn't say anything. How do you resolve this?