Faint lines on cpu chip

Hello,

is it normal to have faint outlines of a square shape on the back of the cpu?

i3570k (costa rica)
Sealed boxed set with dirty booklet inside.
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  1. Hmmmmmmm ! that's a bit strange. Is it really a sealed box ? Don't tell me you purchased it off eBay :)

    The square shape tells you it has been used. Its as simple as that. Heat cycles through thermal paste between integrated CPU cooler and Heat Sink creates that square.

    Definitely a used CPU.
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