It's their property and they can enter when they want."
Really? 3 AM, 4 AM? When they want?
Without any actual suspicion or cause?
Hyperbole much? And reasonable suspicion has been used to enter private homes with hearsay evidence...
However-
1st Disney doesn't have housekeeping 24 hours to just randomly check
2nd disney isn't beefing up security staff to do 3 am random checks nor are the resort managers eager to work 24/7 to disturb you.
3rd-the resorts require a band or card to enter or a stop at security gate. Really a thief or scammer is going to take the trouble to bypass all that when there are much easier targets??
My daughter worked during the prep to Hurricane Irma-this is a situation where every room was REQUIRED to have information out regardless of the sign on the door. period & no exceptions!
What the CMs are supposed to do-knock and announce 3 times prior to entering. If there was a DND/or room occupied sign then they still had to knock-although she learned quickly to knock softly and listen for sounds in the room. Often she was able to wait until someone opened the door and able to NOT disturb a sleeping child (or disturb a dog or cat!) BUT the info on the hurricane had to be left in a guests hand or on every room bed.
For the security checks it often works same way-they are on radios and a "check in" service where if a Housekeeper can't get into a room on their shift it is marked that way. Next shift checks to see if can get in room-if by end of that shift it is still marked DND or unable to get to then a manager/coordinator is notified. If this isn't rectified within a certain amount of time then it escalates through management with last step being the manager of the resort. Oh-and this system lets the coordinators know where the CM on that resort is at most times (I say most because there were a couple times my DD had to take longer than usual to clean up a bio event-after her coordinator and manager got notified she was told to sign off for a while so the resort manager doesn't get beeped-blood on a bathroom wall is harder to clean apparently-she was custodial BTW). She did help housekeeping out on occasion as a "runner" for extra towels etc-again if the guest isn't marked off as completed on that task/request within a certain time frame (think she said 15 minutes) then the request escalates up through chain of command. They can also see if the guest has to request a second time for that service (so no, can't just mark off towels provided if they haven't been-if the guest call again shortly with same request then the coordinator is likely to investigate).
This is the way it is
supposed to work, but as with any human endeavor there will be errors and kinks to work out. Disney also has a habit of rushing policies into place prior to alerting managers and staff as to protocol lately-frustration on guests side and staff side for sure.
Also realize the housekeepers have a strict schedule and time allotment to clean all rooms. So if they know you are checking out they will try to get to those rooms quickly (to get it ready for all the guests requesting early check in/room location requests/extra cleaning etc). I don't mind the knock as we can let housekeeping know the approximate time we will be gone so they can plan their day. Having worked in service industries for years I have a lot of empathy for these staff.