solution number 1 get looking! I don't think it will be replaceable you will probably have to get a new set, you could try playing a sound on find my Samsung this is presuming you have lost it at home if you have lost it outside a really feel for you 😱
As @jimS10 said above, can you use the Smart things find app on your phone to locate it. I believe this is exactly what the purpose of the application is for. If you paired your device to your phone then it should be searchable.