National Insurance Number on Visitor Visa

[iamwidi]

I have just recently left the UK as my Tier 4 student visa ran out on the 30th of October. I'm now back in Australia, where I have been a permanent resident for 15 years however I hold an Indonesian Passport. I need to now apply for a visitor visa to return to the UK for my graduation on the 7th of December (I had an extension on my final project so have a delayed graduation which is past the length of my student visa).

A section of the Visitor Visa Application Form asks: Do you have a UK National Insurance Number?
I applied for one whilst I was a student in the UK as I intended to do part time work (though never ended up doing so) do I need to say that I do? It seems irrelevant for a Visitor Visa application and I'm only worried about admitting it because I don't want them to think I could be coming back to try and work? As I've only just finished uni/not even graduated yet, I don't have a job in Australia and my father (who is travelling with me) is fully funding the trip, I'm afraid this will raise questions?

[CR001]

If you don't say you have one and they check, it is withholding information or false representation or deception as you are not disclosing it when asked in the form.

[iamwidi]

If I haven't had my graduation yet, am I still considered a student? So could my employment status still be considered as a student? I have a letter from the university stating that I am a student and eligible to attend my graduation, (although it is a scanned copy as getting a copy by mail would take too long, should I include the email correspondence as well as evidence?) but technically I have completed my course. I feel like declaring myself as unemployed would raise questions

[noajthan]

If I haven't had my graduation yet, am I still considered a student? So could my employment status still be considered as a student? I have a letter from the university stating that I am a student and eligible to attend my graduation, (although it is a scanned copy as getting a copy by mail would take too long, should I include the email correspondence as well as evidence?) but technically I have completed my course. I feel like declaring myself as unemployed would raise questions

You are over-thinking this.
If you have a NIN, simply answer the question; tell the truth.

It can't be irrelevant for a visitor visa or why would the question be there.

HO will know you have a NIN anyway

If it helps reassure you you can add an explanatory note about the NIN & your trip in a brief covering letter.
You can also emphasise you are not economically active if you think that helps.

[iamwidi]

Thanks for all your advice! Haha yeah I am overthinking it, the more I read and research about the visa application the more worried I get