"All cars have a form of stay holding the front of the floor in place, but rivals noticed an unusually complex arrangement on the Ferrari when the bodywork was off the car in the Melbourne pit garage.
"
Also the likely answer to why they were allowed to run...
Ron is quoted as saying...
"“There is a whole range of things that come to light in the first
race and you go and you say what is legal, and what is not legal.
Most teams are given that current race to enjoy the benefit of the doubt. I think there will be a rationalization of some aspects of some cars that would close the gap if no one did anything."
http://www.totalf1.com/view-article.php?newsid=197806