Revelations that convenience store chain Ministop falsified expiration dates on fresh foods have left its in-store prepared items, most notably its signature handmade onigiri rice balls, at a critical juncture.

The company has introduced safeguards to prevent a repeat of the irregularities, including installing surveillance cameras in kitchen areas and tightening controls on product labeling. It resumed sales on Oct. 15 at two company-operated stores in the city of Chiba.

A full-scale restart remains uncertain, however, as many franchisees remain cautious after the expiration date fraud eroded customer trust. The scandal could reduce operating profit by more than ?1 billion between September and February, the second half of the fiscal year.