If the slot machine required the coin to match the size requirements, another object was inserted into the machine with the shaved coin itself. This object matched the size of the coin perfectly and stayed in the machine, while the shaved coin 'fooled' the optical sensor and fell out of it.

Sex and the City Slots is a slot machine designed by IGT,
based on one of TV’s most controversial franchises of the past
20 years. It is based on the popular and influential HBO series
which ran from 1998 to 2004. The relationship misadventures of
Carrie, Samantha, Charlotte, and Miranda became water cooler
talk — at least for American female office workers.

Sex And The City Slot Machine Wins

The HBO show spawned a successful Sex and the City movie and
a not-so-successful sequel, in 2008 and 2010. IGT has produced a
slot machine which captures the best video and audio from the
franchise. This interactive video slot machine has 5 progressive
jackpots and 6 bonus games. Each of the four main friends from
the show are given their own bonus game, so fans can enjoy
gambling through the eyes of their favorite character.