Honesty and truthfulness ?

"Say: Let truthfulness and courtesy be your adorning." Baha'i Writings

I went to the shop and paid for my goods in cash. Not too unusual for me. But the cashier made a mistake and gave me too much change. I looked at the money I had been given and asked her if it was correct. When she replied 'yes', I hesitated, and asked her if she was sure. She did not understand why I was asking and when I pointed out that she had given me more than she should, she replied "Most folks would have just taken it and said nothing".

I thought it sad that she considered most customers to be dishonest. I suppose it reflects on how we are each brought up as children by our parents.