I struggle too I'd say run like heck and when you see two of the same item bury the one you're currently carrying and match those and try and remember where things are....this one really can be hard
There's less items per person if you have 4 people playing together. So that generally helps.
And that way you've 4 minds to remember where things are. ~ which if you're together / skyping means you can all help each other.
I have tried drawing a reference map and labelling each dig spot, but I still run out of time. I think it's true that this tour is done best with at least one other peep!