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All Canon EF bodies and lenses are serialized. So, it should not be absent.
True, but several of my EOS the SN on the bottom wore off from contact with my hand (no scratches or rubs). It's merely printed on a plastic label not very durable. Also, when the rear mount of a lens is repaired the new part lacks whatever date code was originally imprinted. However, it is burned into the ROM so no biggie if must know what it is.