Inside Job of Hotel Housekeepers

Last week, my son got married and it was held in a simple garden wedding ceremony, just a few miles away from the Hotel where we check in for the wedding preparations.
That day before the wedding, my family need to stay there for the pictorials and videos needed as wedding clip for that memorable event.
When we go back to Hotel after the wedding, we noticed that the room was cleaned and all the stuffs we left were arranged. First i wonder why they allow housekeeping staffs entered the room without our concent, besides we have our keys and left the room locked.
 
Since it was a nice hotel, we thought that employees there were honest. But lately we found out that some of our belongings were lost. The extention cord we used was lost and also inside the other room where the family of the bride stayed lost also some of their belongings, including cell phone chargers, casio wrist watch of the bride, and many more.
The newly wed planed to talk to the management aftet their honeymoon trip. They promised to let the hotel be responsible for the losses.