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Document seems legit, so blatant scam and impersonation is probably not the case (not unheard of).
However that amount is ridiculous even for FedEx, it is probably a mistake with a missing comma or other separator.

I had FedEx representative (a broker company between FedEx and customer - me) try to overcharge me 50 euro for similar product (RSP receiver) and I had them ship it back.
But even those (legal) scammers never go beyond 60 euro or so for made up expenses.

Just keep cool and complain (in written or at least email) to everybody even remotely connected to the issue. Best of luck!