Sain noutokoodin puhelimeen, koska paketti odottaa pakettiautomaatissa.

Sain is the past tense of saada, which usually means to get, receive, obtain.

• saada = to get / receive
• sain = I got / I received

The ending itself already tells you the subject is I, so Finnish does not need minä here.

In Finnish, the verb ending often shows who the subject is, so the pronoun is often left out.

Here:

• sain = I got

Because the -n ending already marks 1st person singular, minä is unnecessary unless you want emphasis.

Compare:

• Sain noutokoodin. = I got the pickup code.
• Minä sain noutokoodin. = I got the pickup code. (more emphasis)

Noutokoodin is the object of the verb sain.

The basic dictionary form is:

• noutokoodi = pickup code / collection code

In this sentence it becomes noutokoodin. This is the normal form for a total object in many sentences, especially when you receive or complete something as a whole.

So:

• Sain noutokoodin = I received the whole code

This is different from a partitive object, which would usually suggest something incomplete, ongoing, or indefinite.

Noutokoodi is a compound word:

• nouto = pickup, collection
• koodi = code

So noutokoodi literally means pickup code or collection code.

Finnish uses compound words very often, so long nouns like this are extremely common.

Puhelimeen is the illative form of puhelin.

• puhelin = phone
• puhelimeen = into the phone / to the phone

In natural English, we would usually say to my phone or on my phone, but Finnish often uses the illative here to show that something arrived into the device, such as a message or code.

So:

• Sain noutokoodin puhelimeen = I got the pickup code to my phone

This is because puhelin belongs to a noun type where the stem changes before endings are added.

The dictionary form is:

• puhelin

But the stem used in many forms is:

• puhelime-

So:

• puhelimeen = into/to the phone
• puhelimessa = in the phone
• puhelimesta = out of/from the phone

This kind of stem change is very common in Finnish nouns.

Because koska introduces a subordinate clause, and in Finnish these are normally separated by a comma.

• koska = because

So the sentence is divided into:

1. Sain noutokoodin puhelimeen
2. koska paketti odottaa pakettiautomaatissa

That comma is standard Finnish punctuation.

Here koska means because.

That is its most common use in modern Finnish.

It can sometimes be encountered with a when meaning in older or more formal styles, but for learners, the important meaning is:

• koska = because

So in this sentence it explains the reason: you received the code because the package is waiting in the parcel locker.

Odottaa is the 3rd person singular present tense of the verb odottaa.

• odottaa = to wait
• paketti odottaa = the package is waiting

Here the verb is used intransitively, meaning to wait without a direct object.

That is why:

• paketti odottaa = the package is waiting

But if you are waiting for something, Finnish often uses a direct object:

• Odotan bussia. = I am waiting for the bus.

So in your sentence, the package itself is the one doing the waiting.

Finnish often says things more directly:

• paketti odottaa = the package is waiting

So paketti is simply the subject of the clause.

English often uses structures like:

• there is a package waiting...
• your package is ready...
• the package is at the locker...

Finnish can use those too in other contexts, but paketti odottaa is perfectly natural and straightforward.

Pakettiautomaatissa is the inessive form, which usually means in or at something.

The basic word is:

• pakettiautomaatti = parcel locker / parcel machine

In the sentence:

• pakettiautomaatissa = in the parcel locker / at the parcel locker

So the ending -ssa / -ssä tells you the location.

It is another Finnish compound word:

• paketti = package, parcel
• automaatti = machine, automated unit

Together:

• pakettiautomaatti = parcel locker / parcel machine

This is a very typical Finnish way of forming vocabulary: combine two nouns into one longer noun.

Finnish does not have articles like English a/an and the.

So:

• paketti can mean a package or the package
• noutokoodi can mean a pickup code or the pickup code

The exact meaning depends on context. In this sentence, context makes it clear which package and which code are meant.

Finnish word order is more flexible than English word order, but the version in your sentence is a very natural, neutral one.

Neutral order:

• Sain noutokoodin puhelimeen, koska paketti odottaa pakettiautomaatissa.

You could change the order for emphasis, but then the sentence may sound more marked or stylistically different.

For example:

• Koska paketti odottaa pakettiautomaatissa, sain noutokoodin puhelimeen.

This is still grammatical, but it shifts the focus a bit.

So the original order is a good standard model for learners.