Currently the ATO and Centrelink require ebay to automatically report all ebay ID,s and IP addresses of sellers who have more than $10,000 in total sales including postage costs PA. That does not mean this is some kind of limit that you can sell up to without being required to report income, just the limit that gets automatically reported. Centrelink may still require access to your bank account details and may see deposits from ebay sales there.
As others have noted if you are selling privately owned items, you should be OK. If any are purchased at a garage sale or op shop with the intention of listing on ebay to sell for a profit, that is declarable income.
Looking at your feedback from sales, I doubt you would exceed the $10,000 limit for mandatory reporting, but some may question the large numbers of new old stock fabric sales, and the number of collectable glassware sales you have on a repeat basis. These could both be from years of private collecting or may have been purchased to resell. You dont have a store with " buy it now" items, so this would help your argument that you are a private seller.
None of this is meant to make any assertions on your sales as I dont know your circumstances, just offering some advice that may help with your question.
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