Sounds like you hunt mostly yards. I do the same thing except they are house demolitions. Best yard was October 2012, where we got 28 silvers off the front yard, 103 wheats and over 300 coins total plus two silver rings. But the best one around here that was verified was 207 silver coins from an area about 6' across on a demo lot. Appeared someone had buried them in a tin container and the demo machine had pushed it around and scattered the iron and silver. Most of those were 30's to 64. I did get in on one dig were we had a map, 7 buried containers, all around an old 60's built house, where we found three of the 7. One was a 5 gallon glass jug filled with almost all modern nickels, pennies, clad and some silver. Next was a gallon milk jug with halves and quarters about 30% silver, and the last we dug was a gallon plastic bucket with 500 walkers and Franklin halves in it. Two other locations, found by the owners of the map, had 2 silver bags with 1000 silver quarters in each and a 2lb silver bar. About 20' away was a 6" PVC filled with quarters. We never found the last two containers.