bunsilmuri ajik an deureowasseoyo.

분실물 means lost property / a lost item.

It is made from:

• 분실 = loss, losing something
• 물 = thing, object

So 분실물 is not the act of losing something; it is the item that was lost. In places like stations, airports, or schools, it often refers to an item being handled by the lost-and-found office.

-이/가 is the subject marker. Since 분실물 ends in a consonant, it takes -이.

So:

• 분실물이 = the lost item (as the subject)

In this sentence, the lost item is what has not come in / has not been turned in yet.

You might also hear 분실물은 in other contexts if the speaker wants to mark it as the topic, but here -이 sounds very natural for simply stating what the situation is.

아직 means still or yet, depending on whether the sentence is positive or negative.

In a negative sentence like this one, it usually means yet:

• 아직 안 들어왔어요 = hasn’t come in yet

It tells you that the situation is not complete so far, but there is an expectation that it may happen later.

They do different jobs.

• 아직 = yet / still
• 안 = not

So:

• 아직 안 들어왔어요 = has not come in yet

You usually need both ideas in English too:

• It hasn’t come in yet not just
• It hasn’t come in

The version without 아직 is possible, but it loses the “so far / up to now” nuance.

Literally, 들어왔어요 comes from 들어오다, which means to come in / to enter / to come into a place.

So word-for-word, the sentence is roughly:

• 분실물이 아직 안 들어왔어요
• The lost item has not come in yet

But in natural English, especially in a lost-and-found situation, it usually means:

• Your lost item hasn’t been turned in yet
• It hasn’t arrived at the lost-and-found yet

So the Korean uses a come in expression where English often uses be turned in or be received.

들어오다 means to come in, with the sense of entering a space or arriving into a system/place.

That makes it a very natural verb when something:

• comes into an office
• comes into a building
• gets submitted
• gets turned in to lost and found

So at a lost-and-found desk, 안 들어왔어요 suggests:

• it has not been brought in
• it has not been submitted
• it has not reached this office yet

Using just 오다 would sound less specific. 들어오다 gives the sense of coming into here.

This is a very common point of confusion for English speakers.

들어왔어요 is the past form of 들어오다, but in Korean, past forms are often used for a completed event or a change of state, and in negative form they can describe whether that event has happened up to now.

So:

• 들어왔어요 = came in / has come in
• 안 들어왔어요 = didn’t come in / hasn’t come in

With 아직, the natural meaning becomes:

• hasn’t come in yet

So although it looks like a simple past form, in context it often matches the English present perfect.

Yes, you could, and people would understand it as it hasn’t come yet.

But 안 들어왔어요 is often more natural in a lost-and-found or office context because it implies:

• it hasn’t been brought in
• it hasn’t been received here
• it hasn’t entered the system/place yet

So:

• 안 왔어요 = simpler, more general
• 안 들어왔어요 = more context-specific and idiomatic for something being turned in or received

Usually, 안 is better here.

Difference:

• 안 = simple negation, not
• 못 = inability, cannot / was unable to

So:

• 아직 안 들어왔어요 = it hasn’t come in yet
• 아직 못 들어왔어요 would sound more like it hasn’t been able to come in yet, which is odd for a lost item in this context

Since the point is not that the item was unable to arrive, but simply that it has not been turned in, 안 is the natural choice.

Korean often leaves agents unstated when they are obvious or unimportant.

In this sentence, the important thing is the status of the lost item:

• The lost item hasn’t come in yet

The person who might turn it in is not mentioned because it is either:

• unknown
• not important
• obvious from context

English often makes this passive:

• It hasn’t been turned in yet

Korean often expresses the same idea without a passive form, using something like 들어오다 instead.

It is in the informal polite style, often called the -어요/-아요 style.

So:

• 들어왔어요 = polite and very common in everyday conversation

At a lost-and-found desk, this is a normal level to use with customers.

Related forms:

• 분실물이 아직 안 들어왔습니다. = more formal
• 분실물이 아직 안 들어왔어. = casual, used with friends or someone younger

It could be passive or more formal, but Korean often prefers a simpler, more natural everyday expression.

Compare:

• 분실물이 아직 안 들어왔어요. = natural spoken Korean, especially at a counter
• 분실물이 아직 접수되지 않았어요. = more formal, more like The lost item has not yet been registered/received
• 분실물이 아직 제출되지 않았어요. = sounds more like documents or official submission, not ideal for lost property

So 안 들어왔어요 is everyday and idiomatic for it hasn’t been brought in yet.

The sentence breaks down like this:

• 분실물-이 = the lost item + subject marker
• 아직 = yet
• 안 = not
• 들어왔어요 = came in / has come in

So the structure is:

Subject + yet + not + came in

A natural English rendering is:

• The lost item hasn’t come in yet or, in context,
• Your lost item hasn’t been turned in yet

This is a good example of how Korean and English may package the same situation differently, even when the meaning is the same.