how to validate if used AntMiner was overclocked

[Mr_Snipes]

Recently i saw an offer for a L3+ with escrow which was 2g2bt (too good to be true)
So i was pondering what it could be. Apart from being broken i thought it might have been overclocked.
That means the warranty is gone. Is there a way to validate if an antminer was overlocked ?
Does Bitmain have a method to see if a broken part was overlocked ? Is there a piece of sw that changes data on a chip ?
The method i see is they could see the result of overheating on the chips once they open the miner. But breaking the seals will void warranty for me.

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[fanatic26]

The only way to see if they were overclocked is if the person left the overclock values in the controller. The controller is what tells the hashing boards how fast to run. Most newer bitmain stuff is unoverclockable with the autotune firmware anyway

[salmanahmedone]

I do not think so, it is broken and the code would be the give away. Why not just trash it. Broken is broken and you can replace it for anywhere from $200 to $5000. You never mentioned which model and the higher the cost does not mean that it is worth fixing, rather that it is more complex and costly to fix.

[Mr_Snipes]

I do not think so, it is broken and the code would be the give away. Why not just trash it. Broken is broken and you can replace it for anywhere from $200 to $5000. You never mentioned which model and the higher the cost does not mean that it is worth fixing, rather that it is more complex and costly to fix.

I was thinking about L3+ and D3. Let's assume your hashing-board is all x-es in the last row. Then you would ship in the hashing-board and not the whole thing.
There are possiblities to make some kind of seal for overclocking sofware-wise. A value being flipped on a memory-chip on the hashing-board for example.
Since i've only seen pictures of these hashing-boards i am not sure if they have that. Or if they just assume overclocking if there is some kind of damage on the chips.