To a degree, I learned long ago that its best to keep expectations in check until you have a solid reason not to, but that can be easier said than done.
A few years back I was finally in a position to detect my grandparents large back yard, house was built in the 1880's and had who knows how many owners previously, they bought it in the early 1950's and had 8 kids, lots of friends, climbing trees, clothe lines, I thought I was really going to hit the mother lode.
First downside I noticed was that all my uncles were big beer drinkers and partyers in the day, even as a kid I remember some of their epic yard filling bashes ,, So it was a pulltab/bottlecap nightmare. But no matter where I looked or how hard I tried, could not find anything except clad and a couple wheaties - Then I remembered, when I was a kid in the late 70's my grandfather showed me a new gizmo he got, a metal detector. For some reason it didn't spark my interest all that much, just thought "cool" then never thought about it again until I realized that he himself had picked that yard clean long ago.
