Sorry to report we did not get in the area of the missing backpack after Cirque was reached late in the day on Saturday. We downclimbed the SE side into the gully to xc back to the trail back to CP TH. I didn't make Langley, but that's ok, another party did in our group, so all in all a great day up in the Sierra's. Great weather. Took New Army Pass, will try Old Army pass up to Langley another time. Thanks for the info all!