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I found an anti-dandruff shampoo in France that was marvelously effective but whose active ingredient isn't in any US anti-dandruff shampoos. I brought four bottles back. I don't need to use it very often to get the effect, shipping liquids is expensive, and I had spare room in my luggage.

OTOH, nobody is trying to smuggle cocaine from France to the US.

It's not uncommon to find a product on vacation, or from your home country that you like so much that you stock up on your return home.

Why is it you find three bottles odd? People who think that way get others arrested in many walks of life by reporting a stranger acting funny.