The two protested in front of the Intercontinental Hotel, on the bank of the Danube, as part of the Podmaniczky Páholy civil organisation, which argues that the replacement of the boxes - just three years before the postal market is deregulated - is unnecessary.
State-owned postal company Magyar Posta is replacing the boxes because their slots are too narrow for A4-sized envelopes and because they are difficult for people in wheelchairs to use.
But Saly argues that paper letters are being replaced by e-mail anyway, and most Hungarians take A4-sized letters to the post office to mail. She says the boxes could be lowered, allowing easier access for people in wheelchairs, but they don't have to be replaced.
One of the protestors, a woman in a wheelchair, agrees. She adds that the replacement boxes are placed just as high as the old boxes, solving nothing.
Magyar Posta plans to spend HUF 1.6bn to replace 13,500 of the old post boxes.
While the old boxes operate with a system - developed by a Hungarian some hundred years ago - that allows them to be emptied directly into a sack, without the postman ever touching them, the replacement boxes must be opened with a key and emptied by hand.
Magyar Posta spokesman Tamás Tomescskó told the Hungarian News Agency that the company was forced to call a tender to replace the old post boxes to comply with new regulations.
Source: Múlt-kor / Hungarian News Agency (MTI)