1) You can certainly write and file a claim with the county sheriff.
2) But, nothing will be accomplished.
3) WDW does not refund cash or lost item - in rooms or in parks.
4) This is a law enforcement matter, and one for your insurance company.
5) Reasons
. . . you are responsible for your own property
. . . there are safes in the rooms
. . . there are safe-deposit boxes for free use at the Front Desk
. . . people do claim a loss, when nothing was stolen
. . . people do claim a loss when they overspend or lose money elsewhere
NOTE: Certainly, there are dishonest people in this world. People-being-people, room service people can be dishonest. Without making any assumptions or assertions, one must always be on their guard against theft or loss. I have yet to hear of someone actually breaking into a room safe, as there is ONLY one key to the room safe, or the specific 4-digit combination that the guest inputs themselves.