said by fatness :

There was a lot of planning involved, that's for sure. He apparently pitched off the vest/mask/blue-shirt outfit, and abandoned the tube further downstream and from there I don't know where he went.

I imagine his planning skills will be severely tested as they investigate the robbery, including who placed the Craigslist ad, from where, and who had contact with him.

said by KrK :

Plus abandoning the clothes as he ran was probably dumb. He probably left behind forensic evidence like hair, etc

Still, it's a masterful idea. This guy wasn't your typical hold-up robber.

“It’s like a movie,” said Monroe police spokeswoman Debbie Willis last week. “I believe this was very well planned.”

The robber certainly didn’t stand out at first glance, said Mitch Ruth, owner of the real estate agency across the street. He only caught Ruth’s eye as Ruth sat at his desk because he was wearing a particle mask.

“The particle mask seemed odd,” said Ruth, also a Monroe city councilman. “Another second later, I saw he had a weed sprayer. I was chuckling to myself, thinking I’m not the only guy who sprays toxic chemicals with shorts on.”

The man leapt through the underbrush bordering Woods Creek, which joins the Skykomish River, and vanished. “We found the mask, and a hat and a blue wig in the alley over here,” said Addington.

Although Woods Creek is fairly shallow, ranging from a few inches to five feet deep, the man appears to have made his getaway in an inner tube, which police found a short time later.

said by rawgerz :

That's how they confirmed some money found in a river in Washington state was part of what was stolen by "D.B Cooper"