Today, as I got into my car after class, I noticed someone had broken
into my car.  I did not notice anything missing except the change that
i had in the holder.  I attend college at a major university (big
ten).  They (the campus police) have been sorta nasty about it.  I had
to go straight to work afterwards and called them on the way.  I have
to make time to go file a report with them.  They have to look through
my car(?).  Anyway, to make a long story short(yeah right), I
sometimes keep a reciept or two(mainly from gas purchases, cause i am
paranoid about them thinking i stole the gas since I have a debtit
card I use) I dont believe* any were missing, but what if someone took
one that had my card number on it(cause some do), and decide to try to
use it to make purchases.  What should I do?  Should I file a report
and if i dont will that make a difference if someone does use the info
for illegal purchases when trying to get the charges taken off??  Any
advice would be great.

While most gas station receipts now drop all but the last four digits
of your credit card number, that is not universally true.  So, since
it costs you nothing to report your card number as being potentially
stolen and avoid problems with its improper use, I suggest doing so. 
Of course, you won't have that particular credit card available to you
until the new one arrives and is activated.  However, this protects
you from any liability if your credit card number is misused.

http://www.ftc.gov/bcp/conline/pubs/credit/atmcard.htm
"Credit, ATM and Debit Cards: What to do if They're Lost or Stolen"
Federal Trade Commission-Facts for Consumers

"Report the loss or theft of your credit cards and your ATM or debit
cards to the card issuers as quickly as possible. Many companies have
toll-free numbers and 24-hour service to deal with such emergencies.
It's a good idea to follow up your phone calls with a letter. Include
your account number, when you noticed your card was missing, and the
date you first reported the loss."

"Credit Card Loss or Fraudulent Charges (FCBA). Your maximum liability
under federal law for unauthorized use of your credit card is $50. If
you report the loss before your credit cards are used, the FCBA says
the card issuer cannot hold you responsible for any unauthorized
charges. If a thief uses your cards before you report them missing,
the most you will owe for unauthorized charges is $50 per card. Also,
if the loss involves your credit card number, but not the card itself,
you have no liability for unauthorized use."

Note that if your debit card number has been stolen, it is even more
important that you report the loss promptly.

"ATM or Debit Card Loss or Fraudulent Transfers (EFTA). Your liability
under federal law for unauthorized use of your ATM or debit card
depends on how quickly you report the loss. If you report an ATM or
debit card missing before it's used without your permission, the EFTA
says the card issuer cannot hold you responsible for any unauthorized
transfers. If unauthorized use occurs before you report it, your
liability under federal law depends on how quickly you report the
loss.

For example, if you report the loss within two business days after you
realize your card is missing, you will not be responsible for more
than $50 for unauthorized use. However, if you don't report the loss
within two business days after you discover the loss, you could lose
up to $500 because of an unauthorized transfer. You also risk
unlimited loss if you fail to report an unauthorized transfer within
60 days after your bank statement containing unauthorized use is
mailed to you. That means you could lose all the money in your bank
account and the unused portion of your line of credit established for
overdrafts. However, for unauthorized transfers involving only your
debit card number (not the loss of the card), you are liable only for
transfers that occur after 60 days following the mailing of your bank
statement containing the unauthorized use and before you report the
loss."

You will have a lot more success having unauthorized charges removed
from your bill if you have reported your card number as being stolen. 
The Federal Trade Commission recommends:

"After the loss, review your billing statements carefully. If they
show any unauthorized charges, it's best to send a letter to the card
issuer describing each questionable charge. Again, tell the card
issuer the date your card was lost or stolen, or when you first
noticed unauthorized charges, and when you first reported the problem
to them. Be sure to send the letter to the address provided for
billing errors. Do not send it with a payment or to the address where
you send your payments unless you are directed to do so."

I hope this helps you deal with your situation effectively.  Please
request clarification if needed.

Sincerely,

Wonko