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they want me to give them 1270 dollars for a 50000 dollar check

Don't do it, it's a scam. The check is fake but good enough to fool a bank teller and it will bounce in a few days. In the meantime, the $1,270 that you send them is REAL money (your money) that you will end up losing. You can also be prosecuted for passing a bad check and will be hit with tons of bank fees.