Being fairly new to more dedicated collecting the last few years and with this silly covid restrictions have made some of us somewhat dependent on using the internet and various selling platforms for collecting. I have had to trust others opinions and descriptions of coins in the marketplace and forums like this for info, data...etc. I have learned that about 50% cannot be trusted(this is the big market/auction sellers not forum ppl) with their opinions on a coin. Numerous what I call high dollar items I have purchased, over trust, has cost me some expensive learning and many of those items have been returnable but some not....in the tune of $2000+. Had this been a brick and mortar store and talking face to face with the seller I can assure you I would regain my losses either by speaking to the person or by legal means if necessary. I don't take being ripped off lightly.
...so, with that being said "Honesty is the best policy"
...and the CAC stuff, it should have NOTHING to do with the grade of a coin IMO but only the additional appearance due to toning, luster and the like.