I would call the parents and ask them when they were going to turn the money in. Letters home are not foolproof as far as communications. If you don't want to call, I would email them directly. While not necessarily the case, it is possible that the parents don't know that the funds have not been turned in. It is not unheard of for kids to either eat the candy or pocket the funds without their parents' knowledge. The parents may be glad you called.
Katie, mama to a pair of boys one little and one not so little.
"No American president has ever supported a major expansion of civil rights that has not ultimately been adopted by the American people - and I have no doubt that this will be no exception. The march of freedom that has sustained our country since the Revolution of 1776 continues, and no matter what setbacks may occur in a given state, freedom will triumph over fear and equality will prevail over exclusion." -Michael Bloomberg