taekbaehame neoheo dun sangjareul chajeuryeogo munjareul dasi hwaginhaesseo.

택배함 means a parcel box, delivery locker, or package locker.

It is made of:

• 택배 = parcel delivery / courier delivery
• 함 = box, container, compartment

So 택배함에 means in the parcel locker or into the delivery box.

Here, 에 marks the location or destination of the action 넣다 (to put in).

So:

• 택배함에 넣다 = to put into the parcel locker

With verbs like 넣다, 에 often marks where something is put.

넣어 둔 comes from 넣어 두다.

-아/어 두다 means:

• do something and leave it that way
• do something in advance for later
• put something somewhere and keep it there

So:

• 넣은 상자 = the box that was put in
• 넣어 둔 상자 = the box that was put in and left there / put there beforehand

In this sentence, 넣어 둔 상자 suggests the box had already been placed in the locker earlier, and now the speaker is trying to retrieve it.

In Korean, clauses that describe a noun come before the noun.

So 택배함에 넣어 둔 상자 literally works like:

• the box [that was put in the parcel locker]

This is a very common Korean pattern:

• 내가 어제 산 책 = the book that I bought yesterday
• 밖에 세워 둔 차 = the car parked outside

So 넣어 둔 is modifying 상자.

-를 marks 상자 as the object of 찾다 (to find / look for).

So:

• 상자를 찾다 = to find the box / to look for the box

Even though the sentence ends with 확인했어, there is a smaller purpose phrase inside it:

• 상자를 찾으려고 = in order to find the box

Within that phrase, 상자 is still the object of 찾다, so it takes -를.

찾으려고 comes from:

• 찾다 = to find / to look for
• -려고 하다 = to intend to / to try to / in order to

In this sentence, -려고 shows purpose:

• 상자를 찾으려고 = in order to find the box / because I was trying to find the box

So the speaker checked the message again for the purpose of finding the box.

Both can express purpose, but they are used a little differently.

• 찾으려고 = in order to find, often connected to a following action of intention or purpose
• 찾으러 = to go and find, usually used with movement verbs like 가다, 오다, 다니다

Examples:

• 상자를 찾으려고 문자를 확인했어 = I checked the message again in order to find the box.
• 상자를 찾으러 갔어 = I went to find the box.

Since the main verb here is 확인했어 (checked), not a movement verb, 찾으려고 fits better.

They belong to different verbs in different parts of the sentence.

• 상자를 찾으려고
  
  • 상자 is the object of 찾다
• 문자를 다시 확인했어
  
  • 문자 is the object of 확인하다

So the structure is basically:

• [택배함에 넣어 둔 상자를 찾으려고] [문자를 다시 확인했어]
• [In order to find the box left in the parcel locker], [I checked the message again].

This is completely normal in Korean.

Here, 문자 usually means a text message or SMS message.

In everyday Korean, 문자 very often refers to a phone text message:

• 문자 보내다 = to send a text
• 문자 받다 = to receive a text
• 문자 확인하다 = to check a text message

So 문자를 다시 확인했어 means the speaker checked the text message again, probably to confirm where the box was.

다시 확인했어 means checked again or looked over again to make sure.

• 다시 = again
• 확인했어 = checked / confirmed

확인하다 is stronger and more specific than 보다:

• 보다 = to see / look at
• 확인하다 = to check, verify, confirm

So 문자를 다시 확인했어 suggests the speaker looked at the message again to verify the information, not just casually glanced at it.

Korean is generally a subject-object-verb language, so the main verb usually comes at the end.

Here, the main action is:

• 문자를 다시 확인했어 = checked the message again

Everything before that gives extra information:

• what box
• where it was
• why the speaker checked the message

A rough breakdown is:

• 택배함에 넣어 둔 상자를 = the box that had been put in the parcel locker
• 찾으려고 = in order to find it
• 문자를 다시 확인했어 = checked the message again

So the final verb tells you what actually happened.

The subject is omitted, which is very common in Korean.

From 확인했어, we understand the speaker is probably talking about I:

• (나는) ... 확인했어 = (I) checked ...

Korean often leaves out subjects when they are obvious from context.

So even though 나/나는 is not written, the sentence naturally reads as something like:

• I checked the text message again in order to find the box left in the parcel locker.

확인했어 is in the casual/informal polite-low style often called 반말.

It comes from:

• 확인했어 = casual past
• 확인했어요 = polite past
• 확인했습니다 = formal past

So depending on the situation, you could also say:

• 택배함에 넣어 둔 상자를 찾으려고 문자를 다시 확인했어요.
• 택배함에 넣어 둔 상자를 찾으려고 문자를 다시 확인했습니다.

The meaning stays basically the same; only the politeness changes.

Yes. Korean 찾다 can mean both to find and to look for, depending on context.

In this sentence, 찾으려고 is best understood as trying to locate / looking for the box.

So in natural English, this could be understood as:

• to find the box
• to locate the box
• to look for the box

Korean does not always separate find and look for as strictly as English does.

A useful way to read it is in three chunks:

1. 택배함에 넣어 둔 상자를
   = the box that had been put in the parcel locker

2. 찾으려고
   = in order to find it

3. 문자를 다시 확인했어
   = checked the text message again

So the sentence builds like this:

• [the box put in the parcel locker]
• [in order to find it]
• [I checked the text message again]

That chunking method is often the easiest way to process long Korean sentences.