The sex-links are 100% accurate, so a little difference in their markings is nothing to worry about. I have 26 Black sex-links and some have more gold in their necks than others.
ETA: Although, being a feed store, it is also possible that they may have mixed some other breeds in (not uncommon!) I would check a hatchery webpage to get an idea of what they should look like, just in case.
ETA: Although, being a feed store, it is also possible that they may have mixed some other breeds in (not uncommon!) I would check a hatchery webpage to get an idea of what they should look like, just in case.
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