This doesn't involve treasure hunting, but it is one horrid forget.
Last winter, my wife had me drive her to the bus to go to the US. I asked her when she got in the car if she had her documents. Usually, I make her show them to me. But, she was so positive she had them that I skipped that step.
Well, she had had them just before she changed purses but not after.
All night on the bus, 15 hours it never occurred to her to look. When she hit the US border, she found she couldn't enter.
Then, she did not bother to call, so she was actually missing for 24 hours. Panic in the entire family. McAllen police looking for her. We were standing in front of our house discussing what to do when she came walking down the walk. She got on a bus coming back, and spent another night. She tried to call once, and couldn't figure out how to call, so just didn't bother again. She seemed surprised we were nervous.
Never again will I let her go without personally seeing her documents. And, she no longer complains when I tell her I have to see them first.
Also, I bought a $35 cell phone so she can call us if there are any problems.
I do not drive.Have you ever drove ten miles from home and pull your tector out and find that you forgot to put your battery pack in your machine.