Have you asked a knowledgeable person in the store? Sometimes they know. Could be a number of things, not all of them bad. Example: indication of the year of production; location of manufacture; or something totally meant for corporate purposes.
I looked at the boning knife in my Henckels set and I see what you mean. There are two lines of boxes forming a 2X6 grid. The fourth box from the left in the lower line is blacked in; the rest are "open". It also says the knife was made in Spain, right next to the grid.
My 7" Santoku has the same 12-box grid, but different boxes are blacked in: boxes 1 and 6 (from left to right) on the top line, and box 2 from the left on the lower line are blacked in. This knife was made in Germany, but that information is in a different location. The set is older than the Santoku, FWIW.
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