Collections
If it has been 30 days since you mailed your check, contact your bank to be sure the check has been cashed. If the check has been cashed, then get a copy of the canceled check, front and back, and send a copy with your billing notice in the return envelope provided.
If the check was not cashed, please allow an additional 30 days for processing.
If it has been longer than 60 days and your check has not been cashed, you may want to consider putting a stop payment on the lost check and sending another to:
Iowa Department of Revenue
PO Box 10471
Des Moines IA 50306-0471