Hi,
I have also checked with B&H and had talked to them about the used lens(100-400L), for which they have confirmed it has only cosmetic wear and the glass elements are perfectly intact. They also provide 30-day money back guarantee and 90-day warranty for the used item.
If you have someone who travels frequently to US its better to buy new from US so that you get the 2-Year US warranty for them. Else you may go for the Used one.
Regards and Best of Luck
Krishnadas N Mallya
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