Im no dowser benny, but I do have experience and use common sense. First I check foundation corners, next run the fence line and property boundries....I focus on property corners, and fence posts. Next imagine your self looking out a kitchen window....caches are often buried in spots where the depositor could glance out the window, and see the spot and keep an eye on it. Often times ill search out the cloths line area....usally this is within view of a window as mentioned before. This is a spot where the loose pocket change ends up on the ground, and a post for a cloths line is a great cache marker. Next of course is the old growth trees...I always check these trees for caches, and I often bury my own caches in the roots and shade of an old marker tree....look for marks or hardware on and in the tree. Large stumps should be checked also. Barns, sheds,and out houses have always been go to hiding spots, and should be checked....same approach under stairs, and all four corners of the structures, or foundations....of course basements and root cellars are hot spots also.....caches are often times buried at depths that are frustratingly deep, and patience and determination are a virtue when cache hunting. I my self bury my caches at depths that are detectable and tested with my detector. I think most caches are buried within view of the main house, and its reassuring to the depositor to be able to glance out a window and make sure no one is obviously digging the spot.
Here is my shallow crystal skull cache going in the ground !!
I use jars with metal lids....they are sealed in blue tape, and then dipped in hot paraffin wax !! Last pic is what that spot looks like now....I call this dime cache of 30 bucks the pissy cache....I often pee on it !!


So that my advice for searching out caches....hope it helps !!
I have found several over the years, and am searching for one now...I have found 2 that were already recovered at my latest spot....there were no banks in the islands for many years....the islanders buried there money !!
Cheers Benny !!