Not sure this is much different than what you already do, but it might help...

At the teacher luncheon, which occurs the day before school starts, we pass out to each teacher a laminated folder/envelope, approx. 8 1/2 x11 in size, that the teachers are expected to use for transmission of any papers and/or money to PTO's mailbox. PTO reps then empty the envelopes at pickup, and return the envelopes to the teachers box for future use.

Any ideas on how to handle the money being brought to school by kids (for yearbooks, etc.) Right now the kids bring money to school, the teachers bring that money to the office to put in the PTO mailbox, then the treasurer picks it up. Last year a deposit was misplaced (for yearbook orders). Principal does not want the teachers handling money. There are approx. 45 classrooms. Need advice on how to handle this in a secure manner.