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.