HELP... Chem Library Book Not Returned

<p>Hi, so I had these three books that were due at the chem library on 1/11/10. I returned all of them outside of the chem library before I left for home. Apparently two of them were cleared, but one still says its checked out online. I just got the email saying its due in three days. I can't even renew it because it says my registration expired today. What does that mean? Will I be charged for this book? Is there any way to challenge them if they say I lost it?
Thanks a lot, and any help is appreciated.e</p>

<p>call the chem library and explain what happened</p>