The cache is not at the posted coordinates
Here is a simple little puzzle, a different twist on an old idea
N 38 56.610, W 099 16.487
N 40 53.244, W 073 33.422
N 39 18.047, W 076 26.670
N 35 58.620, W 083 26.896
N 40 46.925, W 124 05.560
S 31 50.094, E 115 51.084
N 44 03.130, W 084 48.160
N 40 41.456, W 073 58.940
N 41 02.020, W 073 31.497
N 28 34.589, W 081 26.264
N 37 27.436, W 086 53.633
N 34 03.121, W 118 31.320
N 45 20.666, W 122 36.874
N 34 04.186, W 077 54.894
N 47 48.737, W 122 13.420
You can validate your puzzle solution with certitude.