Abstract: A parking meter coin box receptacle retrofits into an existing parking meter while increasing the interior volume of the coin box receptacle, so that more coins can be accumulated between periodic emptying of the box. Moreover, the coin box receptacle includes an exterior display portion to hold a seal, in a secure visible position for locking with a bore within an interior rod within the receptacle. A fastener is in positional register with the seal, and a bore within the fastener accommodates a fiber optic strand within the seal fastener, to hold the locking rod in place and to indicate tampering when the fiber optic strand is cut. The exterior display portion of the coin box receptacle includes an outwardly facing window, so that the bar code on the seal fastener can be easily viewed while the seal fastener is in place in a locked position.