"Goods" is a plural noun. When speaking about items for sale or objects that can be moved from one place to another, the term "goods" only has a plural form.
"Belongings" is a plural noun. "Belonging" (without "s") has a different meaning. It refers to a feeling of being accepted in a particular place or with a particular group of people.
The word "remains" is a plural noun. Some nouns, like "remains", only have a plural form. They are also called pluralia tantum (Latin for "plural only").