On your refund, these things are generally just handled filing of routine forms. It looks like you are from PA. In your state, the Department of Revenue handles sales tax.
www.revenue.state.pa.us/
You can browse their site or call them to find out the proper procedure. I did find one sort of similar question in their online database:
Q. While I was preparing to file my Sales Tax, I noticed that I overpaid my Sales Tax for the last period. How do I get the overpayment back?
A. You may petition for a refund or claim a credit on future sales tax returns. To petition of a refund, please complete a REV 65 (Petition Form). You may download this by logging onto
www.revenue.state.pa.us
and clicking on forms and publications. Then scroll to other forms and publications, click on that, and next scroll to the REV 65. Print it out, fill it out, and send it to the provided address. To claim a credit on future tax returns, place the amount of credit on line 8 of the Pa-3. You may take this credit on additional tax returns if the amount of credit is higher than the actual amount owed.