Normally when customs open a package and find a brand watch with no declaration or documentation like about a repaired watch, they will contact the addressee and will charge import tax if picked up. If they think it is fake, the addressee will be notified about destruction of the watch or you could get a letter from a lawyer.
They will never send an empty package so I guess maybe a postman now is wearing your watch....speaking from personal experience...
In some countries DHL is responsable for the tax handling.