What is the word 'thereto'? [closed]

I was reading article that uses "thereto" a lot.

I searched its meaning and I found "to the thing just mentioned".

It's still not clear to me.

For example in this sentence:

The government has the right to inspect any such establishment or any papers or records relating thereto.

What is the "thing that just mentioned" on that sentence? Is it the government or "the right to inspect"?

The meaning of 'thereto' is just what it looks like: "to the thing referred". 'There' can be anything, but mostly it refers to a written piece of material.

A very common phrase is: "any additions/changes thereto". For example, "After you submit the form, you will not be allowed to make any changes thereto". "Thereto" does not appear in conversational English, even in the most formal settings. Its characteristic use is in legal or highly formal writings.

In a comment, Greybeard answered:

Thereto is an adverb, and modifies "relating". In older English, the combination {there + preposition} was used to mean {preposition + it}. There are a limited number of the "there+prep." forms that are used currently with "therefore" being the commonest. Most other uses are formal, legal, or somewhat old-fashioned.