Robbing of spas is a common occurrence, It just doesn't make the news all the time
A manager I know had her spa robbed twice over an 8 month period.
after the second time, she had enforcers guard the spa for the next few months, once their guard was down BOOM! happened again.
After the third time I suggested to her to place an add by the counter saying "Less than $50 is kept in the register" and to make several deposits thorough the day.
The cops suggested to place a camera pointing to the register and to have height marks on the exit door
that seemed to do the trick has not happened again.
Asian spas are known for preferring cash payments and for keeping the day receipts in the tilt, Bad policy