[mothered]

I was planning to order the samsung tab s8 using Amazon.com.au and say it came as wrong item and say they gave the tab s7

Amazon won't fall for It - they'll Insist on returning the correct Item.

Moreover, It's their policy to dispose of wrong Item returns (not part of their Inventory), so say goodbye to your S7.

or get some samsung seals to try and attempt to return it as if it was sealed.

As with Apple, Amazon checks sealed box returns.