Rare coins you've owned, have you seen them at auction years later?

I think of some of the rare coins I've owned, I don't think I've seen them subsequently at auction. Would an exhaustive search of public auction records turn up most rare coins? Or does the average hold period preclude that in many cases?
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Sold my 1872 PCGS MS63 RB two cent piece to a dealer at the CSNS several years ago and it appeared on Heritage about a year later. The dealer took a loss.
Maybe. It might have traded hands a dozen times in a year.
Yes, has happened a few times, sometimes they did a little better, sometimes they fared worse for the next guy
How would I find this coin, that was in an old PCGS holder?

Do you know what it graded?
I have quite a few times. About a year ago I sold a Buffalo Nickel with the grade of 66 that I thought just barely made the grade and should of probably been a 65. Then I saw the coin sell at Heritage in a 67 holder for a huge profit to whoever had it upgraded. I feel sorry for the new owner.
I've seen most of my better rarer date choice/gem seated quarters, dimes, and half dimes make it back to the market again. Though in many cases that took 10 yrs or more. In the case of my "gem" 1858-0 quarter (finest graded) I didn't see it from about 1990 to 2014....almost 25 yrs. My ex-1867-s quarter took an 11 yr vacation until the Gene Gardner auctions occurred. It's sort of fascinating to see how they progress through the grading changes of the past 20-30 yrs. The 1867-s 25c was considered a gem MS65 back in the 1975-1980 era.....then MS66 in 1986. Today it's in a PCGS MS67 CAC holder.
Things change. Interesting though that the price has not changed all that much in the past 17 yrs. With the 1858-0 quarter it graded NGC MS65 back in 1988 when standards were very strict.....worth around $23K-$25K back then Today it's PCGS MS65.....though no sticker....and still in that same $25K range 30 yrs later. Goes to show how strong those 1980, 1990, and 2006-2008 market peaks were for gem coins.
MS61 though I would not have been surprised if it upgraded to 62; nothing in PCGS true views on the coin.
Yes.
I recognize many trade dollars cross the different markets
11.5$ Southern Dollars, The little “Big Easy” set
Among the rarest coins that I have sold at auction include a 1794 "Starred Reverse" Large Cent (less than 100 known) and a 1808 Quarter Eagle with an estimated 50-60 survivors existent.
I have seen neither reappear at auction.
Another rare coin that I once owned is this 1849 $5 Mormon Gold in a high AU grade. Have not seen it reappear but if it had would per the PCGS price guides likely have sold for a multiple of its prior value. (PCGS pop numbers are 11 in AU50, 11 in AU53, 11 in AU55 with 7 higher to include 5 in AU58. Obviously a number of those were likely upgrade attempts so probably less than two dozen total in PCGS recognized AU50 and above grades.)
You then have the PCGS cert # ?... therefore 1st go to PCGS Cert Verification site and start there ... I am not sure how far back their data base goes but they will list known references to previous auctions appearances for that specific cert # . And in the case it may have been regraded or reholdered by NGC - then use the PCGS auction data base and look at auction record photos from other auctions to see if you can find a match. I have used the later process to cross link current coins in auctions to previous examples and in some cases they have been regraded to a higher MS/PF grade. One coin I bought was cracked out and must have came back from PCGS with the same grade but the previous version had a CAC attached. Those High def photos do come in handy.
Good luck
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I don't have the certification number on that 1799 that I sold through Teletrade and as far as I know their auction results cannot be accessed. Also did not see a reappearance of the Eagle Collection 1862 $20 Lib. in NGC AU58 as well as the Eagle 1868 $20; definitely would be cac but was sold before that.