wanchungjaewa baesongbireul gogaek senteo-e munuihaessseupnida.

와/과 is the noun-linking particle meaning and.

• 완충재와 배송비 = packing material and shipping cost

You choose between them based on the final sound of the noun before it:

• after a noun ending in a vowel → 와
• after a noun ending in a consonant → 과

Since 완충재 ends in the vowel sound ㅐ, it becomes 완충재와.

Examples:

• 사과와 배 = apples and pears
• 책과 펜 = books and pens

In Korean, when two nouns are joined with 와/과, the case particle often appears only once at the end of the whole noun phrase.

So:

• 완충재와 배송비를
  means
• packing material and shipping cost
  • object marker

The 를 applies to both nouns together.

This is like treating 완충재와 배송비 as one combined object:

• [완충재와 배송비]를 문의했습니다
• I inquired about [the packing material and the shipping cost].

You would not normally say:

• 완충재를와 배송비를 ❌

Here, 고객 센터에 marks the place or target where the inquiry was directed.

• 고객 센터에 문의했습니다 = I inquired with/to the customer service center

With 문의하다, the person or organization receiving the inquiry is often marked with:

• 에
• sometimes 에게 if the target is clearly a person

Since 고객 센터 is an organization/place-like target, 에 is the most natural choice.

Compare:

• 직원에게 물어봤어요 = I asked the staff member
• 고객센터에 문의했어요 = I contacted/inquired with customer service

So 에 here is not just a location marker in the English sense; it marks the destination/target of the inquiry.

문의했습니다 comes from the verb 문의하다, which means:

• to inquire
• to make an inquiry
• to ask (formally/businesslike)

Breakdown:

• 문의하다 = dictionary form
• 문의했- = past tense stem
• -습니다 = formal polite ending

So 문의했습니다 means:

• inquired
• made an inquiry
• asked (in a formal/polite way)

This is a common style in customer service, emails, business situations, and polite reporting.

Great question. These all relate to asking, but the tone is different.

1. 묻다 / 물어보다

These are the everyday verbs for ask.

• 길을 물어봤어요 = I asked for directions.
• 친구한테 물었어요 = I asked my friend.

These sound normal and conversational.

2. 문의하다

This is more formal and often used when contacting:

• customer service
• an office
• a company
• an institution

It often means:

• to inquire
• to contact for information

So in this sentence, 문의했습니다 sounds much more appropriate than casual 물어봤어요 if the context is business or customer support.

완충재 is a packaging/materials word. It refers to something used to protect items from shock during shipping or packing.

It can mean things like:

• cushioning material
• protective packing material
• padding
• bubble wrap, foam, etc. depending on context

Word breakdown:

• 완충 = buffering, cushioning, shock absorption
• 재 = material

So 완충재 literally means something like cushioning material.

In real life, you will very often see:

• 고객센터

written as one word.

Spacing in Korean can vary a bit in practice, especially with compound nouns and business terms. Both may appear, but 고객센터 is the more common modern spelling in many contexts such as websites, notices, and customer support pages.

So this sentence might also appear as:

• 완충재와 배송비를 고객센터에 문의했습니다.

Same meaning.

Yes. That is the natural interpretation.

The structure is:

• 완충재와 배송비를 = about the packing material and the shipping cost
• 고객 센터에 = to customer service
• 문의했습니다 = inquired

So the sentence means the speaker contacted customer service and asked about those two things.

In English, we often say ask about, and in Korean that about idea is often understood from the verb and object structure.

Yes, that is often possible, and sometimes it sounds clearer.

The original sentence is understandable, but Korean often makes the topic of inquiry more explicit with:

• 에 대해 = about, regarding
• 관련해서 = regarding, in relation to

For example:

• 완충재와 배송비에 대해 고객센터에 문의했습니다.
• 완충재와 배송비 관련해서 고객센터에 문의했습니다.

These can sound a little more explicit than simply using 를.

That said, N을/를 문의하다 is also common, especially in business-like Korean, so the original sentence is not wrong.

It is in the formal polite style, using -습니다.

• 문의했습니다 = formal polite past

This style is common in:

• business communication
• written reports
• customer service messages
• polite statements to strangers

Less formal versions would be:

• 문의했어요 = polite but less formal
• 문의했어 = casual

So this sentence sounds fairly official or professionally polite.

문의하다 can take a direct object, so 완충재와 배송비를 문의했습니다 is grammatically possible.

Common patterns include:

1. N을/를 문의하다

   • 배송비를 문의했습니다.
   • I inquired about the shipping cost.

2. N에 대해 문의하다

   • 배송비에 대해 문의했습니다.
   • I inquired about the shipping cost.

3. A에 B를 문의하다

   • 고객센터에 배송비를 문의했습니다.
   • I asked customer service about the shipping cost.

So the sentence follows a normal pattern:

• [thing asked about] + 를
• [target of inquiry] + 에
• 문의하다

Yes. Korean word order is flexible as long as the particles stay correct.

For example, these are all possible:

• 완충재와 배송비를 고객센터에 문의했습니다.
• 고객센터에 완충재와 배송비를 문의했습니다.
• 고객센터에 완충재와 배송비에 대해 문의했습니다.

They all mean roughly the same thing, though the emphasis may shift slightly.

In Korean, the verb usually stays at the end, but the earlier parts can move around more than in English.