He probably started work there shortly before December 2009. It is revealed that Oscar Martinez secretly has a crush on him and that Matt is also gay. Pam spends the whole Christmas party trying to get Oscar and Matt to bond. ("Secret Santa")
Meeting with Jo Bennett
He and the rest of the warehouse staff talks to CEO Jo Bennett. ("St. Patrick's Day") Later, Oscar tries to continue his relationship with Matt, and they play basketball together at the bar. Darryl continues to realize their relationship, and Darryl tells Oscar that Matt is dumb. ("Happy Hour")
Winning the Lottery
When the warehouse wins the lottery it is assumed that Matt received his money and quit along with all the other warehouse workers.
Darryl comments that Matt is dumb. It is implied by Darryl that Matt is gay
Pam tried to set Oscar and Matt up, but it didn't succeed.
Matt is a warehouse worker at the Dunder Mifflin Scranton Warehouse. He quit after the warehouse workers won the lottery.