Where can I get an independent review about Young & company?

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Hi again mylotters.I have been contacting Young & Company- a stamp dealer in USA.He asked me to send him large packets of unused Ethiopian stamps( I don't Know whether it is 1000,2000, or 100 ) so that he will pay me from 500 -1000 US dollars.But my problem is I couldn't get an independent review about Young & Company from the internet.In addition I have been contacting him through mail ( the company doesn't even have email address).How can I trust the company?What should I do mylotters?I need your advice.