your drop is waiting for you in the circled area which you will find at the coordinates in the photo
drop - is a rock radius 1-3 cm, there is an example on the photo
the drop is laying on the ground, digging is not necessary, it is just laying in the middle of the grass/leaves
it is not worth it to go for the drop at night, first of all it will be considerably harder to find, and secondly, it is easier to come across patrol
be attentive and careful, wish you an easy removal