The Cosmo image gallery at
COSMO-SkyMed / CUGS does contain preview images by date/time/position.
Whether it contains every shot taken is another question, but you can see the image the slick was taken from and on the left hand side if you search carefully the slick itself, in lower resolution than the one in the Drift Group report.
The photo of a slick from an aircraft very early in the search is still on the Aviation Herald near the bottom of the page
Crash: Air France A332 over Atlantic on Jun 1st 2009, aircraft impacted ocean .