Police busted the thief who robbed a postman for his mailbox master keys, authorities said Wednesday.

Gasim Kromah, 21, stuck his hand in his jacket pocket and pretended to have a gun when he mugged the mailman as he was delivering to a building on Ridge Boulevard near 93rd Street in Bay Ridge around 1 p.m. Monday.

The thief ordered him to hand over the master key that opens all of the boxes in the area and eventually fled with them following a brief struggle.

Kromah then jumped into a getaway car driven by his pal Jelmainer Reyez-Fortunato, 22, cops said.

On Tuesday afternoon, police found Kromah using the master keys to open op the boxes of a building not far from where the robbery took place, cops said.

He was charged with robbery, petit larceny, displaying a firearm, possession of stolen property and possession of burglars tools.

Reyez-Fortunato was also arrested and charged with petit larceny and possession of stolen property.

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