I’m guessing the chances of them finding our probes might be astronomical. But if there are objective reasons for finding the areas of “scientific interest” that we’ve chosen to explore, that would bring them closer to the same general region of the planet. What sorts of observations would they need to make to uncover our by-then ancient probes? Would simple metal detection work? Density scans of the dunes that show something the density of hardened rubber (tires)? What would be the easiest way for them to detect such a thing?
I guess a secondary question might be that if there -is- a practical answer, might that be something -we- would want to consider watching for, so long as it doesn’t take too much time, energy or effort away from more likely studies?