I'm not sure I get what "out in the open" means to you. Leaving stuff out in your private, locked room qualifies as "out in the open" to you? If that's the case, when one goes to take a shower, they should lock up their laptop, wallet, jewelry, artwork, mobile phone, etc....? Personally, my laptop is on my desk and one may find my mobile there or on the kitchen counter at any given time.... I don't worry at all about leaving money or jewelry out on my desk either (I might think twice about leaving it there if anything had a high value and I were to leave my home, not just in the shower, but in the context of this story, we're talking very small amounts of money.). And I don't take any artwork off the walls or from other display areas they may be sitting when I leave my place, they are VERY MUCH "out in the open". I think I would behave similarly in the context of a hotel room as well.
Perhaps you misread the story and you thought the guy was in a public place rather than in his private, locked hotel room, which he hadn't even left, but was just in the shower?