I am not sure whether to put it here or under Commander (sorry).
But I have an idea to automate a lot of the Lost & Found processing.

In the Commander where housekeeping can change the room status, there should also be a section "Lost & Found" added. A housekeeper or the Housekeeping Manager can create a lost & found ticket so the item can be labeled with the number given by the system. This will make it easy to track.

While entering the data you will get a dropdown to select several frequently found items (this will make sure translation is correct for all offered languages) and a choice "other" that will enable a free text field.

When selecting something from the dropdown and saving, an automatic Navigator message (or otherwise e-mail) will be sent to the last guest sleeping in that specific room. "We will keep your items for 3 months, or we can calculate the shipping costs for you" with a call to action button.

=> CTA button gets clicked => Guest can double check if the address data is still correct (for the shipping), modify it or add a shipping address. And then clicks "Confirm".

=> A task gets created in the Commander, leading to a page where you can enter the cost of the shipping + handling fee (if hotel charges this).

=> Mail with payment link will be sent and payment will be processed through the Merchant

=> Payment is confirmed, a new task to ship the lost & found item will be created.

When the free text field was used, first a task will be created to insert a translation of the item to be entered in the automatic e-mail template. After this, the flow from above will be followed.

Also, this will enable hotels to look up the lost & found items in Mews when they get a call from the guest. Search possible on guest name or on room number,...
If you didn't have any valid contact information, the hotel staff can add it there during the phone call and trigger the above flow from there.