According to DEC 2010 report, they show that 99% of the fish that came through the trailer are clipped. They make no mention of 15% missed.
See link http://www.dec.ny.gov/docs/fish_marine_ ... 0part1.pdf
Some of the big 4 year olds in 2011 are still unclipped since marking began in 2008 so some of those fish could account for some of the unclipped kings out there. Around 5-10% of the kings in the lake are four year olds based on past years reports.