Автопродление и уведомление о расторжении уже проверили.

Russian often leaves out the subject when it is obvious from context or when the speaker means an unspecified they.

So Автопродление и уведомление о расторжении уже проверили most naturally means something like:

• They have already checked the auto-renewal and the termination notice
• or, in more natural English, The auto-renewal and the termination notice have already been checked

This is a very common Russian pattern. The verb проверили is in the past plural, which often signals an omitted they.

Most likely they are in the accusative case as direct objects of проверили.

However, for inanimate neuter singular nouns, the nominative and accusative forms are identical:

• автопродление = nominative or accusative
• уведомление = nominative or accusative

So the form itself does not tell you the case. You understand it from the sentence structure and meaning.

Here, the idea is that someone checked these things, so they are objects, not subjects.

Because проверили is agreeing with an implied plural subject: they.

The sentence does not mean that автопродление and уведомление are doing the checking. Instead, it means that someone checked them.

So the logic is:

• (Они) уже проверили автопродление и уведомление о расторжении.
• They already checked the auto-renewal and the termination notice.

The plural ending -ли in проверили is the normal past tense plural ending.

Yes. Even though the Russian sentence is grammatically active, English often prefers a passive translation here.

Russian:

• Автопродление и уведомление о расторжении уже проверили.

Literal structure:

• They already checked the auto-renewal and the termination notice.

Natural English:

• The auto-renewal and the termination notice have already been checked.

So the Russian uses an indefinite-personal construction, while English often turns that into a passive.

Because the noun уведомление commonly takes the preposition о when it means notice about / notice of something.

So:

• уведомление о расторжении
• literally notice about termination

After о, Russian uses the prepositional case, so:

• расторжение → о расторжении

This is a standard pattern:

• сообщение о встрече = a message about the meeting
• документ о собственности = a document about ownership
• уведомление о расторжении = notice of termination

Проверили is the past tense of проверить, the perfective verb.

Perfective is used because the speaker is talking about a completed result: the checking has already been done.

Compare:

• проверили = checked, have checked, finished checking
• проверяли = were checking, checked repeatedly, were in the process of checking

With уже, perfective is especially common, because already usually points to a completed action.

So уже проверили means have already checked / already checked.

Because уже usually goes near the word or phrase it modifies, and here it modifies the action checked already.

So:

• уже проверили = already checked

Russian word order is flexible, so other placements are possible depending on emphasis, but this position is very normal and neutral.

For example:

• Уже проверили автопродление и уведомление о расторжении.
• Автопродление уже проверили.

In your sentence, уже проверили sounds natural and straightforward.

Russian word order is much more flexible than English word order.

Putting автопродление и уведомление о расторжении first makes them the topic of the sentence, the things currently being discussed.

So the structure is roughly:

• As for the auto-renewal and the termination notice, they have already checked them.

This kind of fronting is very common in Russian, especially when the speaker is continuing a conversation about those items.

A more neutral word order would be:

• Уже проверили автопродление и уведомление о расторжении.
• or Мы уже проверили автопродление и уведомление о расторжении.

A clearly passive version would usually use a short passive participle:

• Автопродление и уведомление о расторжении уже проверены.

That means:

• The auto-renewal and the termination notice have already been checked.

Notice the difference:

• проверили = they checked
• проверены = are checked / have been checked

Also note that проверены is plural, because there are two items.

So your original sentence is active with an omitted subject, while проверены would be truly passive.

Yes, a little.

The main source of ambiguity is that:

• автопродление and уведомление could look like nominative forms
• but for inanimate neuter nouns, nominative and accusative are identical

So a learner may first wonder whether these nouns are the subject.

In practice, meaning and context solve it:

• documents and contract items do not usually check something
• people check documents and contract items

So the natural reading is that these are objects, and the subject is omitted.

That kind of ambiguity is common in Russian, and native speakers resolve it instantly from context.