Police say the attack by two cane corso dogs "left people injured and understandably shaken".
Operation Stormecho comes in response to safety concerns over the vehicles' use in Northamptonshire.
The charges relate to incidents against 10 girls between 2022 and 2025.
A police force says the bins offer a "secure alternative" to disposing of knives in general waste.
Northamptonshire Police has renewed an appeal for information.
Harshita Brella's family do not believe Northamptonshire Police did enough to keep her safe.
Eight people are arrested and 140 vehicles are seized.
The prime suspect, Harshita Brella's husband, remains on the run after her alleged murder in 2024.
The prime suspect, Harshita Brella's husband, remains on the run after her murder in 2024.
