My son had $80 stolen from our room at the Boardwalk Inn. Pretty sure it was the housekeeper. My son, who is 10 years old, thought he was hiding it by putting it under the alarm clock! (I was unaware he was hiding his money there!) He was heartbroken because he saved up his money to buy junk.
He learned an $80 lesson, don't leave cash in the room and don't be so trusting. And if you do leave money in the room, wrap it up in some dirty underwear! That's the last place a housekeeper would want to dig around for money.
BTW, we always tip our Mousekeepers $5/day so I don't think she should have been disgruntled. I did not tell them at the front desk.