I have seen first-hand "funny business" by some grey market importers in Australia, e.g. new lenses in boxes that have obviously been opened before, missing warranty cards (wasn't really a problem, and it's now no longer relevant), missing some of the packaging material, or missing date code/serial numbers.
I've never had a problem with the ~ 13 L lenses that I've bought (and later sold) from official distributors over the years.
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