After being rescued by Robin, Foxy was pointed to Porche and Hamburg's cell by Sanji.
After both his and Luffy's wounds from the match were healed a bit, Foxy decided to honorably congratulate Luffy for the match.
Luffy later defeated Komei, and Foxy and the Straw Hats returned to the Thousand Sunny as they waited for Straw Hat to arrive.
It is possible that these whiskers may have simply been removed due to disrepair.
The Foxy Pirates depressed over the crude new Jolly Roger Luffy drew for them.
As Komei prepared to attack the two of them, however, Foxy arrived on Kansho's back and held the Vice Admiral at gunpoint, allowing Nami to rescue Luffy.