Ditto, and that's why it's all "significant valuables". At least for my last couple tours since I carry so little. Luckily I can bring everything along with me into a store if need be thanks to the folding ability.
It's futile to ask others if they watch your stuff.
Case 1: Local road cyclist were sitting outside a coffee shop. They agreed to watch my bike while I went in to purchase food. They were gone when I came out.
Case 2: Store clerk was smoking in-front of the store. We talked and the clerk offered to watch the bike. As I went into the store she followed me.
Of course if you don't expect it you get special treatment like at a restaurant that had a security person outside. He was so interested in the bike he rarely took an eye off it while I was eating. Even though I never asked and had it in sight most of the time.