Indiana Code Title 6. Taxation § 6-1.1-24-10

Sec. 10. (a) When a certificate of sale is issued under section 9 of this chapter, the county treasurer shall indorse upon, or attach to, the certificate of sale a written guarantee which is signed by the treasurer and which warrants:

(b) If the county treasurer, before the time of making the guarantee required by this section, received payment of the delinquent taxes or special assessments for which the real property was sold, the holder of the certificate is entitled to the amount due for an invalid sale under IC 6-1.1-25-10.