Some '68 Mint Sets.
I finally dug down through safety deposit boxes to find the "20" best I has cherry picked up until about 1990. These were pristine when I wrapped them in plastic and put them in a humidity controlled box. The Denver packets weren't too bad. About 6 or 7 are still pristine which is pretty remarkable. Most of the others weren't too bad. The Philly packets are all dark (tarnished). A few of the S mint cents are good but the Philly's have carbon spots.
Most of these will clean up OK but I have a lot of trouble with the Philly dimes.