To me it seem there are only three ways in which high grade examples survive
1 That somebody in 1908 or any other year stored away a batch of brand new examples which then at a later date ended up in the hands of collectors. [ if this had happened to the 164a you would have expected many examples in high grade to be in circulation between collectors and dealers. This I think must have been the case for the F14 LCW under foot, of which there are many high grade examples, also I believe with the 2* which I surmise was part of a test run using this die that were never released into circulation, but that a small batch was smuggled out of the mint. This would account for all of the examples found so far being of a high grade,
2 That an odd example is taken out of the country in loose change, and being of no use in that country sat in the back of a draw for many years surviving almost unworn
3 and the odd example or two that was lost at or around the time of the production, and survived at the back of a draw , or by falling through the floorboards, or some other such way. These lost coins that subsequently reappear would I think be what happened to the odd 164a and the Hollow neck and open 3, though not in the case of the F169 , as I personally have never seen an example better than good fine.