It looks like you're okay. From the Copic FAQ:
Q: Will it hurt my markers if they get too hot or too cold?
Short periods of hot or cold will not affect your markers, such as leaving them in your car during a snowstorm or in the middle of a heatwave. Copic markers have completely air-tight caps. They can be submerged in water or left in the sun and they will not dry out as long as the caps are sealed.
However, long exposure – such as storing them above a heater or in a freezing basement for months at a time – may cause the dye and alcohol to separate a little. You would notice this if one nib is coloring darker than the other side. If this happens, move them to a more temperate location and store them on their side or upside down for a few days. This will re-mix the ink. Otherwise, no harm has been caused to your markers."
FAQ Markers | iCopic.com