De haber llamado, habría recibido la etiqueta de devolución.

De haber llamado is a more condensed, slightly more formal way of expressing the same idea as si hubiera llamado.

So:

• Si hubiera llamado, habría recibido la etiqueta de devolución.
• De haber llamado, habría recibido la etiqueta de devolución.

Both mean essentially the same thing: a past condition that did not happen, and its unreal result.

This de + infinitive structure is especially common in formal writing, customer service language, notices, and journalism. To an English speaker, it often feels a bit like Had he/she called, ... in English.

Haber llamado is the perfect infinitive.

It is made with:

• haber
  • past participle
• here: haber llamado

It means to have called.

In this sentence, it refers to an action that would have happened before the result in the main clause.

So the timeline is:

1. first: call
2. then: receive the return label

That is why Spanish uses haber llamado rather than just llamar.

Habría recibido is the conditional perfect.

It is formed with:

• habría
  • past participle
• here: habría recibido

This tense is used for something that would have happened in the past, but did not happen because the condition was not fulfilled.

So the structure is:

• De haber llamado = if the person had called
• habría recibido = they would have received

This is a standard pattern for unreal past situations.

Spanish often leaves out subject pronouns when they are understood from context.

In this sentence, the subject is not explicitly stated, so it could mean:

• I
• you (formal)
• he
• she

The exact person depends on the surrounding context.

Also, the sentence strongly suggests that the same person did both actions:

• the person who would have called
• the person who would have received the label

If Spanish wanted to make the subject clearer, it could add a pronoun or noun:

• De haber llamado usted, habría recibido la etiqueta de devolución.
• De haber llamado Marta, habría recibido la etiqueta de devolución.

It is definitely understandable and correct, but it sounds a bit more formal, written, or elevated than si hubiera llamado.

In everyday conversation, many speakers would more naturally say:

• Si hubiera llamado, habría recibido la etiqueta de devolución.

The de + infinitive version is common in:

• formal messages
• instructions
• customer service language
• legal or administrative writing
• news style

So yes, it is common, but not usually the most casual option.

Yes.

You can also say:

• Habría recibido la etiqueta de devolución de haber llamado.

This means the same thing.

When the conditional phrase comes first, Spanish often uses a comma:

• De haber llamado, habría recibido...

When it comes second, the comma is often omitted, though punctuation can vary by style.

No. That is an important point.

De + infinitive does not always mean if. It only has that conditional meaning in certain structures, like this one.

For example:

• De haberlo sabido, habría ido. = If I had known, I would have gone.

But in many other sentences, de simply keeps its normal meanings, such as of, from, or part of a fixed expression.

So you should learn this as a specific pattern:

• de + infinitive / de + haber + participle
  = a formal way of expressing a condition

In Spain, etiqueta de devolución usually means a return label, especially for sending back a product by post or courier.

Typical context:

• online shopping
• parcels
• customer returns

So this is the label you attach to a package when returning an item.

This is a very natural expression in Spain.

In standard Spanish, especially in careful or formal usage, the expected pattern is:

• si/de + pluperfect subjunctive
• conditional perfect

So:

• Si hubiera llamado, habría recibido...
• De haber llamado, habría recibido...

That is why habría recibido is the standard choice here.

You may sometimes hear forms like hubiera recibido in the main clause in some varieties or less formal usage, but for learners, the safest and most standard model is:

• hubiera llamado / de haber llamado
• habría recibido

Because De haber llamado is an introductory subordinate clause.

When that kind of conditional clause comes before the main clause, Spanish normally separates it with a comma:

• De haber llamado, habría recibido la etiqueta de devolución.

This is similar to English punctuation in sentences like:

• If he had called, he would have received the return label.

So the comma is normal and expected here.