Many SBC have a thin area in #8 at the back side. The edge looks rough (no die grinder work) and they usually don't crack there, but that block would never be used in any build leaving my shop.
Since you are only installing it, that should relieve you of any responsibility of the build. All the same make a note of it on the invoice and keep photo evidence to cover your assets in case of possible future legal action.
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Monty Frerichs
B&M Machine
Box Elder SD
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