Repay / reclaim duty / tax on items bought in Australia

I don’t live in Australia but bought items while there and got GST back from TRS.

Now when I come back to Australia with those items, do I have to pay the GST back even if I won’t leave those items there but take them with me when I leave?

And if so, can I reclaim that money when I leave Australia? As it is explained, GST can only be claimed within 60 days of purchase.

So does it mean that I permanently lose the GST refund just by carrying those items with me?

My question is related to the one below but that one doesn’t answer my case. Duty on items bought in Australia

What does Zerodium do with their bought exploits and bugs? [closed]

I came across the cybersecurity company Zerodium. They offer bigger bounties than most of the companies calling for bug hunters: Bounties

Because of the bigger bug bounties, bug hunters sell their found exploits/bugs to Zerodium rather than to the company having the exploits/bugs.

On their “About us” page they don’t mention what they do with their bought exploits and bugs or how they earn their money. In their faq they mention:

ZERODIUM customers are mainly government organizations in need of specific and tailored cybersecurity capabilities, as well as major corporations from defense, technology, and financial sectors, in need of protective solutions to defend against zero-day attacks. Access to ZERODIUM solutions and capabilities is highly restricted and is only available to a very limited number of organizations.

Is there any further information to their customers and what Zerodium does with their purchased exploits and bugs?

My friend bought me a ticket on his card

I’m traveling alone by Egyptair from Nigeria to Russia.The ticket was bought by my friend and by his DEBIT CARD. After I printed out the ticket, I saw in the rules that CREDIT CARD holder must be one of the travellers. And the company can remove the passenger from the flight if he does not show a card which tickets were paid for. Does it work with DEBIT CARD too? Should I worry about this?

And another problem is that my friend mixed up my first and last name when he booked a ticket. I know this is not so critical, but in this situation can it also affect. My friend says everything will be fine, but I’m not sure.enter image description here

Duty on items bought in Australia

I was wondering if you buy an item in Australia and then travel overseas with it, when you are returning back to australia do you have to pay tax on it if the items are worth more than 900$ limit? If i travel with my laptop, mobile and camera (easily worth more than 1000$ ) that i bought in Australia (used items), do i have to pay GST or duty again when i am coming back to Australia with them? What about the items that i bought in Australia and claimed TRS on it but used it overseas and then travelling back with it (now worth less than 1000$ ?) Thanks.