Extremely high wbc (17.1), neutrophils (9371), and eosinophils (3933) but everything else normal. no signs of sickness, infection, and no allergies. what could this be?

While the neutrophil count is still not elevated, the eosinophil count at 3933 is extremely high, and may indicate an allergic reaction or rare form of blood disorder. Get a referral to a hematologist for an accurate assessment of the results.

You have leukocytosis with high absolute count of eosinophils (eosinophilia). If you think you are at risk for a parasite infestation due to recent travel or exposure, tests should be done. Otherwise, you should have blood rechecked in one month or later and if eosinophilia persists and you are still asymtomatic by then, you have a condition called hypereosinophila of undetermined significance.