A couple of examples of finding things when "You are not looking!"
One of my hobbies that I don't do often enough is browsing garage sales, thrift stores and antiques markets.
I am always nosing around without any expectations at all, and often finding things I wasn't looking for.
The desk in my work-at-home-office I found brand new in a thrift store. But also smaller stuff, like a pair of new pliers, old Uranium glassware, forging tongs, an interesting hammer.
My wife knows that if we are somewhere and stumbling into an antiques market, we're delayed by a couple of hours
I am never looking for anything particular, but I want to have seen everything because I hate walking away, not having seen everything and then missing a big treasure by only a couple of feet