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Ask the seller what his definition of "bricked" is. Can he get into fastboot mode by pressing volume down and power?
If not, then what's curious is he should be able to take it or send it into Google for them to "warranty" the phone because it's technically still under warranty. The usual claim of, "I dun work" should be enough for them to simply plug it in, realize it loads fine for firehose, and do an edl flash to restore it back to working order.