Accuracy Of PCGS Population Reports Questioned ?

I was just going thru some of my collection to see what low survival population coins I may have. Naturally, the older bust types, and early cents and Half Cents have not only low mintages but low survival rates as well. I came across a 1843 braided hair cent in my collection that by all standards is not rare yet when I checked the PCGS population reports, it lists this coin as a R-6.4 with an estimated survival in all grades of only 300. When I did an ebay search for 1843 cents it shows a list of 305 of them.So I guess my question is, how much faith should I be putting in the estimated survival reports? Could their rating of R6.4 and 300 surviving be just a misprint? This was for the 1843 Mature head and large letters reverse.