I worked as a waitress for a hotel with a resteraunt/bar. The afternoon bartenders were roommates. Together they stole several thousand before they got caught. They were just not ringing up drink sales and pocketing the money. They got caught because they got greedy and started taking too much, they managers knew the bar had to be taking in something during the afternoon hours.
We had a person in the business office here steal several hundred from students. They paid in cash, she didn't post it and walked away with the money. ALWAYS ask for a receipt--tell your kids if they pay their college tuition, ALWAYS ask for a receipt.
In my child care center I had a parent steal but it was the fault of a scatterbrained staff member. The parent was paying tuition in cash. My staff person was writing a receipt and talking to the parent. When she handed the parent the receipt, she also handed her the money. (another parent witnessed it). The parent just walked out with the money and tried to accuse my staff person of stealing it.
I also had a father to steal my purse, I came in at 5:30 a.m. and opened and inadvertently left my purse sitting on a table just inside the door. I went in the kitchen to make sure things were ready for the cook to make breakfast and saw a car pull out of the driveway. He came in, got my purse and left with his child.

It really frightened me because I was alone when it happened. Installed a door bell and from then on, until one of my employees arrived, the parents had to ring the bell for me to let them in.
People around here take tape, staples, pens, pencils, copy paper, lables, etc. all the time.