Guardei o comprovativo de entrega com o aviso de receção.

Guardei is the first-person singular preterite of guardar. It means the speaker is talking about one completed action in the past.

So here, guardei means something like I kept, I saved, I put away, or I filed away, depending on context.

Portuguese often drops subject pronouns when the verb ending already makes the subject clear.

• Guardei = I kept / I saved
• The ending -ei already shows it is I

You could say Eu guardei..., but that would usually add emphasis, contrast, or clarity.

In this sentence, guardar means to keep, to store, to save, or to put away.

It does not usually mean to guard in the English sense of physically protecting something. With documents, guardar often means:

• to keep it
• to file it
• to retain it for future use

So the idea is that the speaker kept the document rather than threw it away.

Comprovativo is a very common European Portuguese word for a document that proves something.

Depending on context, it can be translated as:

• proof
• receipt
• supporting document
• confirmation document

In comprovativo de entrega, it refers to a document that proves the delivery happened.

A useful note: in Brazilian Portuguese, comprovante is often more common than comprovativo.

The definite article o suggests that these are specific documents, not just any documents.

So:

• o comprovativo = the proof / the receipt
• o aviso = the notice / the acknowledgment

This often happens when the speaker and listener already know which documents are being referred to, or when they are understood from the situation.

In Portuguese, de + noun is very often used to create a kind of label or type of document.

So:

• comprovativo de entrega = proof of delivery / delivery receipt
• aviso de receção = acknowledgment of receipt

Using de entrega sounds like naming the category of document.
If you said da entrega, it would point more strongly to a specific delivery event.

So both are possible in some contexts, but de entrega is the more natural fixed expression here.

Aviso de receção is a fairly formal or administrative expression. It refers to a document or notice confirming that something was received.

In postal or legal contexts, it is often like:

• acknowledgment of receipt
• return receipt
• proof that the item was received

In European Portuguese, this is a very normal expression. In Brazilian Portuguese, the equivalent is often aviso de recebimento (AR).

Receção is the modern standard spelling in European Portuguese under current orthographic rules.

Older spelling:

• recepção

Modern spelling:

• receção

The p was removed because it is not pronounced in standard European Portuguese. So if you see recepção, it is older spelling, but you may still come across it in older texts.

Yes. Com here means with.

The most natural reading is:

• the speaker kept the proof of delivery together with the acknowledgment of receipt

So com o aviso de receção tells you what the proof was kept with.

If you wanted to make that idea even clearer, Portuguese could also say juntamente com:

• Guardei o comprovativo de entrega juntamente com o aviso de receção.

Most naturally, it goes with the whole action: the speaker kept one document together with another.

So the idea is:

• I kept the proof of delivery with the acknowledgment of receipt

In real context, a listener could also understand that the proof of delivery was somehow associated with that acknowledgment, but the simplest reading is that both documents were kept together.

Yes, it sounds very much like European Portuguese, especially because of:

• comprovativo
• aviso de receção
• the spelling receção

A Brazilian Portuguese version would more likely use:

• comprovante
• recebimento instead of receção

So this sentence is a good example of administrative or postal language from Portugal.

Yes, it sounds fairly formal or administrative, mainly because of the nouns comprovativo and aviso de receção.

This is the kind of language you might see in:

• postal contexts
• legal contexts
• official paperwork
• customer service or bureaucratic situations

In everyday casual speech, a person might use simpler wording depending on the situation, but this sentence is completely natural.