Squamish Chinook from Tenderfoot Creek hatchery have also only been tagged and clipped for 4 or 5 years, so they would be showing up in Howe Sound the past couple of years as well. But you are right, there is a decent chance clipped fish could have been Puget Sound, or Cowichan, or many other stocks. Check out BonCHovy's instagram page, he has the tag results from all of the clipped fish they caught last year. A bit of a mixed bag, but many Capilano hatchery fish.Thanks for letting us know I know of clipped chinook guys were catching in Howe sound and they just assumed they were Columbia fish I hope they turned in their heads.
https://www.instagram.com/p/BeHfFTfn_g7/?taken-by=bonchovyfishingcharters