It is believed that the men used the toy to rob their targets along Campbell Road.
Foot-beat police officers stumbled upon the pair lying on the ground in the bushes, apparently to avoid detection.
Upon searching them, officers found the fake weapon, which was described as a black 9mm toy gun.
The men were, however, charged with possession of a dangerous weapon. Police are now urging members of the public who were previously robbed by two men matching the description of the arrested pair to contact the Boksburg police on 011 841 6859.
* Also on July 18, the Boksburg police arrested three alleged copper-cable thieves following a tip-off officers received from a member of the public, who spotted the trio carrying stolen copper cables on the N17 Freeway.
