Go to the service desk and describe what you've misplaced. They do keep things that are turned in, in the office/safe.
Ask at the service desk to see if anyone turned it in or you can call the service desk and ask. If someone found it and turned it in that is where it would be
You can go to the service desk and ask if anyone turned your missing item in, they usually keep lost things in a locked drawer.
Thanks! Your answer is awaiting moderation.