> once the investigators start asking you about it you have to lie to them

You literally don't, that's what the fifth amendment is for

there's a large lack of creativity in these comments. pay for a deer lease, go hunting, don't bring phone, bury gold somewhere random in thousands of acres of land deep enough metal detectors won't find it, kill deer, go home. repeat 3x a year and it's both not suspicious at all but also basically impossible for others to find the gold at that point even if they suspect.