Way back there was an issue about the proper stock to use in the Westport pens. It was thought by the locals that the Satrap stock would put more fish in the sport fishery than the Hump stock. So, the locals paid for CWTs. When it became time to look for returnees WDFW didn't have the money to go looking; so they didn't.

Just possible that there were no funds to monitor for the returning fish. At least a cynic would think that.