Hello @Natalie101
I am so sorry you have come back from your honeymoon to find this. How devastating.
I presume you have already filed a police report. And that you think it was a previous guests because there was no sign of a break in.
It would seem strange that your last set of guests came into your listing, found major items not there such as a TV and hi fi and not said anything to you. Why do you think it wasn't them?
Who prepared the place before they arrived, was the TV and other items there then?
Take photos and video's.
If you are sure it wasn't your last guests then claim on your home insurance for short term rentals.
If it could have been them then file a claim on the Airbnb guarantee.