help ive lost my apple watch and the play a sound feature isn't working

basically, about two months ago i moved house and i am 100% certain i didn't leave my apple watch there however i haven't seen it since and i dont remember what box i packed it in. I have unpacked all the boxes it in theory would be in and it's not in them. so i tried using find my iphone however there's no location found, so i tried to 'play a sound' and it says

'connecting' before about thirty seconds later theres a seperate pop up that says 'sound pending... will play when connected'. on multiple occasions i've left it loading for a long time and nothing comes of it so mostly i just want to know why the sound can't connect. i presume the watch has ran out of battery so im not surprised it cant track it but i thought, from youtube tutorials of this situation, the play sound feature should still work.