I would give it a couple weeks before getting concerned. It takes a little time for things to make their way from the resorts to the central lost and found. It has only been three days. I have read posts where people have reported items missing, but instead of getting a call, the item is sent to them and shows up unannounced at their home.
However, there is always the possibility that you won’t get it back. Of course, it is always possible that housekeeping took it (a friend of mine forgot to put jewelry in the safe before going to the pool, and it was gone when she returned to the room). It is also possible that housekeeping didn’t see it and the next guest to check into that room took it. It’s possible it could get lost somewhere in the process of moving from the resort to the main lost and found without anyone stealing it. I can’t tell you how many valuables I have found in the parks and the resorts, and when I am handing it over to a CM I often wonder if it will make it back to the person who lost it.
I hope you hear back from them soon.