Očuvana stvar je bez traga korišćenja.

A natural translation would be:

The item is well preserved and shows no signs of use.

Depending on context, especially in ads or listings, you could also say:

• The item is in excellent condition, with no signs of use.
• The item has no trace of wear.
• The item looks unused.

Očuvana means preserved, well kept, or in good condition.

It is the feminine singular form of a passive adjective/participle from the verb očuvati or related očuvati se / očuvan in usage. In everyday Serbian, očuvan / očuvana / očuvano is very common in descriptions of objects, apartments, books, clothes, furniture, and similar things.

Here it suggests that the item has been kept carefully and is still in very good condition.

Because stvar is a feminine noun, and adjectives in Serbian must agree with the noun in:

• gender
• number
• case

So:

• očuvan = masculine singular
• očuvana = feminine singular
• očuvano = neuter singular

Since stvar is feminine singular, the correct form is očuvana stvar.

Yes, stvar literally means thing, but in this kind of sentence it often means item or object.

In marketplace or product-description language, Serbian often uses very general nouns like stvar, predmet, roba, or simply leaves the noun implied from context.

So here stvar is best understood as:

• item
• object
• piece

rather than just the vague English word thing.

Bez traga literally means without a trace.

It is a common expression. In this sentence, it means there is not even the slightest sign of use.

So:

• bez traga korišćenja = without a trace of use
• more naturally in English: with no signs of use

Because the preposition bez always requires the genitive case.

The noun is:

• nominative: trag = trace
• genitive: traga

So:

• bez traga = without a trace

This is a very important pattern in Serbian:

• bez šećera = without sugar
• bez problema = without a problem / without problems
• bez razloga = without reason

Korišćenja is the genitive singular form of korišćenje meaning use or usage.

Here it depends on trag:

• trag korišćenja = a trace of use

Then the whole phrase is inside bez + genitive:

• bez traga korišćenja = without a trace of use

So there are really two relationships here:

1. bez requires traga
2. trag is followed by korišćenja meaning trace of use

They are close, and both can often mean use, but they are not always identical in tone.

• korišćenje often means using or usage
• upotreba often means use, sometimes in a slightly more formal or practical sense

In product descriptions, tragovi korišćenja is a very common phrase meaning signs of use or wear marks.

You may also hear:

• bez tragova upotrebe
• bez znakova korišćenja

These are similar, but tragovi korišćenja is especially common.

That is just a difference in idiomatic expression.

Serbian often says:

• bez traga korišćenja = literally without a trace of use

English more naturally often uses the plural:

• with no signs of use
• without any signs of wear

So even though trag is singular in Serbian, the best English translation may be plural.

Yes, especially in descriptions of items for sale, second-hand goods, books, phones, furniture, clothes, and similar things.

It sounds a bit like listing language or advertisement language, not like something you would usually say in casual conversation about every object around you.

In a sales context, it sounds very natural.

Yes, and in fact bez tragova korišćenja is probably even more common in many contexts.

Compare:

• bez traga korišćenja = without a trace of use
  This sounds a bit stronger and more idiomatic, emphasizing that there is absolutely no sign at all.

• bez tragova korišćenja = without signs of use
  This is also very natural and perhaps slightly more straightforward.

Both are correct.

Yes. Serbian word order is more flexible than English word order.

For example, you could also say:

• Stvar je očuvana, bez traga korišćenja.
• Očuvana je stvar, bez traga korišćenja.
  This one is less neutral and would depend more on context or emphasis.

The original sentence is fine, but in real usage many speakers might prefer:

• Stvar je očuvana i bez traga korišćenja.
• Stvar je očuvana, bez tragova korišćenja.

Je is the present tense of biti (to be) and links the subject with the description:

• stvar je očuvana = the item is preserved / in good condition

In standard Serbian prose, it should be there.

However, in ads, headlines, or note-like style, Serbian sometimes omits forms of to be, especially for brevity. So in an ad you might see shortened fragments like:

• Očuvana stvar, bez tragova korišćenja.

That is acceptable in listing style, but as a full standard sentence, je is normal.

The main thing is that it sounds somewhat formal or commercial, and stvar is a little vague.

In real product listings, Serbian speakers might more often write something like:

• Predmet je očuvan i bez tragova korišćenja.
• Stvar je odlično očuvana.
• Bez tragova korišćenja.
• Kao novo.

So the sentence is understandable and correct, but it has a somewhat descriptive, ad-like flavor rather than everyday conversational style.