I'm a new seasonal cashier and I trained for about 30 mins. They threw me by myself during tax free weekend on a Sunday (thankfully I had four years of cashier training at food lion.) anyway at food lion we give customers their checks back, therefore I accidentally gave a guest their check back after it was processed through the machine. This happened my first day of training and I've worked three days after that so far & no one has said anything about it. I'm extremely worried that this could cause me possible termination. It was a honest mistake and happened on my first day, but I know I'm in a 90-day probation period. Any thoughts?