Demonstrative pronouns: Possessive structures

According to the Linguapress website:

We can use THAT/THOSE OF or ...'S (ONES (S)) in possessive structures.

Do these sentences sound natural?
The first tourist's papers were in order, but those of the remaining tourists weren't.
The first tourist's papers were in order, but the remaining tourists' ones weren't.
Ref. linguapress

Thank you a lot, people.

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Mr. IBRAHIM,

Please, pay attention to the Genitive Case in tourists' papers.

When we are talking about possession, the most common structure in spoken English is:

The first tourists' papers were in order; the other ones weren't.
The first tourists' papers were in order; the remaining ones weren't.
The first tourists' papers were in order; the remaining ones were not. [emphatic sentence]

The expressions the other ones or the remaining ones is used to refer to (a) the papers of the other tourists or (b) the tourits' second papers, depending on the context.

The structures that of and those of tend to be only used in formal contexts, particularly written English:

The first tourists' papers were in order, but those of the remaining tourists were not.

In this sentence, we only refer to the papers of the other tourists.

Other possible examples would be:

The first tourists' papers were in order, but those remaining ones were not.
The first tourists' papers were in order, but those (ones) of them were not.

The expression were not is an example of redundancy due to the adversative conjunction but.
_ _ _

The following sentence is wrong:

The first tourist's papers were in order, but the remaining tourist's ones weren't.

There is no need to repeat the word tourist's because the idea of tourist's papers is already given by the word remaining ones.
_ _ _

I hope it helps! :)
If you have more questions, just ask.

So long,

Ricardo.