سواء فقدت المحفظة في المحطة أم في الشارع، سأبلغ عنها.

It is a very common pattern meaning whether ... or ....

So:

• سواء فقدت المحفظة في المحطة أم في الشارع = whether the wallet was lost at the station or in the street

It often has the broader sense of:

• regardless of whether ... or ...
• no matter whether ... or ...

So the idea is: the location does not change what the speaker will do.

No. سواء can also mean equal, the same, or it makes no difference, depending on context.

But in the pattern سواء ... أم ..., it is best understood as:

• whether ... or ...

So this is a fixed expression worth learning as a chunk.

After سواء, Standard Arabic normally uses أم.

So the usual pairing is:

• سواء ... أم ...

not usually:

• سواء ... أو ...

Both أم and أو can relate to or, but here أم is the standard partner of سواء.

This is a very important Arabic-reading question.

In normal Arabic writing, short vowels are usually not written, so فقدت can represent more than one form. Depending on context, it could be read in different ways.

Here, because of the meaning, it is read as the passive:

• فُقِدَتْ
• was lost

So the phrase is understood as:

• فُقِدَتِ المحفظةُ
• the wallet was lost

Without vowels, the same spelling could also match other forms, such as I lost. Context tells you which reading is intended.

Because verb-first word order is very common in Modern Standard Arabic.

So Arabic naturally says something like:

• فُقِدَتِ المحفظةُ
• literally: was lost the wallet

In smoother English, of course, you say:

• the wallet was lost

So this is just normal Arabic sentence structure, not something unusual.

Because المحفظة is a feminine noun.

A few things show that:

• It ends in ـة, which very often marks a feminine noun.
• The verb is understood as feminine singular: فُقِدَتْ
• The pronoun in عنها is ها, which means her/it for a feminine singular noun

So:

• عنها = about it
• and it refers to المحفظة

In Arabic, nouns that are grammatically feminine take feminine agreement even when English would just say it.

Because Arabic, like English, often leaves out repeated words when they are already understood.

The full idea is:

• whether the wallet was lost at the station or [was lost] in the street

Arabic does not need to repeat فُقِدَت in the second part, because it is already clear.

So:

• في المحطة أم في الشارع

works naturally as two alternative locations.

Because the meaning to report something/someone is commonly expressed with the preposition عن.

So:

• أبلغ عن ... = report ... or more literally inform/report about ...

That is why the sentence says:

• سأبلغ عنها
• I will report it

If you said:

• سأبلغها

that would usually mean something more like:

• I will inform her or
• I will notify her

So the preposition عن is important here.

It is the future marker.

So:

• أبلغ = I report / I am reporting
• سأبلغ = I will report

It is the short future form. A longer alternative is:

• سوف أبلغ عنها
• I will report it

Both are correct, but سـ is shorter and very common.

Because repeating the preposition makes the two alternatives clear and balanced.

So Arabic naturally says:

• في المحطة أم في الشارع
• at the station or in the street

This is especially natural after سواء ... أم ..., where you are clearly setting up two parallel options.

In English we also often do something similar:

• at the station or in the street

Repeating في helps the structure sound complete and neat.