Originalemballasjen kreves ved tilbakeleveringen.

Because Norwegian very often makes compound nouns by writing them as a single word.

So:

• original = original
• emballasje = packaging
• originalemballasje = original packaging

Then the definite ending is added:

• originalemballasjen = the original packaging

This is very normal in Norwegian. English often writes these as separate words, but Norwegian usually joins them.

The ending -n makes the noun definite singular.

• en originalemballasje = an original packaging / the original packaging as a type
• originalemballasjen = the original packaging

In this sentence, the speaker means the specific packaging that belongs to the item being returned, so the definite form is natural.

Kreves is the verb kreve in the -s passive form.

• å kreve = to require
• krever = requires
• kreves = is required

So:

• Originalemballasjen kreves = The original packaging is required

Norwegian often uses this -s passive instead of a separate word like is plus a past participle.

Compare:

• Det kreves legitimasjon. = ID is required.
• Originalemballasjen kreves ved tilbakeleveringen. = The original packaging is required upon return.

Because Norwegian can build the passive directly into the verb with -s.

English:

• is required

Norwegian:

• kreves

So the idea of is required is already included in kreves. This is one of the most important differences from English.

A more expanded Norwegian passive would be possible in some contexts, for example:

• Originalemballasjen er påkrevd ...

But kreves is very natural in formal notices and rules.

Literally, it means something like:

• ved = at / upon / in connection with
• tilbakeleveringen = the return / the handing back

So:

• ved tilbakeleveringen = upon return, when it is returned, or at the time of return

It sounds slightly formal, which fits this kind of rule or policy statement.

Again, this is the definite form.

• tilbakelevering = return / returning
• tilbakeleveringen = the return / the returning

The sentence is referring to a specific event: the return of the item in question. That is why the definite form is used.

This is very common in formal Norwegian, where English might also use a more general expression like upon return.

Yes. It comes from the idea of returning something.

You can think of it as built from:

• tilbake = back
• levere = deliver / hand in / hand over

So tilbakelevere means to return / hand back, and tilbakelevering is the noun return / handing back.

Norwegian often forms nouns like this with -ing.

Examples:

• å bestille → bestilling = to order → order/ordering
• å betale → betaling = to pay → payment
• å tilbakelevere → tilbakelevering = to return → return/returning

Yes, it sounds fairly formal and administrative.

It is the kind of sentence you might see in:

• store policies
• rental agreements
• return instructions
• warranty terms

A less formal way to express a similar idea could be:

• Du må ha med originalemballasjen når du leverer den tilbake.
  • You must bring the original packaging when you return it.

The original sentence is shorter and more impersonal, which is typical of formal written Norwegian.

Usually no, not naturally in English.

In this sentence, ved is better understood as:

• at
• upon
• when
• in connection with

So ved tilbakeleveringen is best translated as:

• upon return
• when returning it
• at the time of return

English by the return would sound unnatural here.

The sentence has a very straightforward Norwegian word order:

• Originalemballasjen = subject
• kreves = verb
• ved tilbakeleveringen = adverbial phrase

So it follows the common pattern:

• Subject + verb + other information

This makes it easy to read as a formal statement:

• The original packaging
  • is required
    • upon return

Yes. Several alternatives are possible, depending on style.

For example:

• Originalemballasje kreves ved tilbakelevering.

  • Original packaging is required upon return.
  • This sounds a bit more general.

• Originalemballasjen må leveres tilbake sammen med varen.

  • The original packaging must be returned together with the item.

• Du må levere varen tilbake i originalemballasjen.

  • You must return the item in the original packaging.

The version you were given is concise and typical of written rules or conditions.