This is a scam and fraudulent employment offer. The scammers are using the identity of NY based company Route Brokers Inc, and TX based Sinclair Customer Metrics. Sinclair Customer Metrics issues a consumer alert warning potential shoppers about the scam which you can read here. Business Consumer Alliance has a report for the real Route Brokers, Inc.
For information on secret shopper scams see BCA's blog, "You Shouldn’t Bank On That Check".