Are you using software to generate these theft numbers for you?
I don't think I'll necessarily be able to track theft as accurately as you because I'm just doing lollipop honor boxes. Each box can hold 63 lollipops, with the box stating it's .50 cents each or 3 for $1. So if in one week 30 lollipops are gone and I collect $15 then I can verify there was zero theft. But if I collect $10 then I really can't know if that was theft or everyone just doing 3 for $1.
But of course my hope is everything will be offset by the random generous person that doesn't even want a lollipop, they just put in $10 or $20 for the charity purpose.