Was it the orginal legal tender of the day auctioned off or was that interest that built that amount?
If interest What? What bank held it? I might like to put 2k into that bank now for 700 years into the future.
https://www.nytimes.com/1990/04/21/us/from-ben-franklin-a-gift-that-s-worth-two-fights.html
https://www.historynet.com/ben-franklins-gift-keeps-giving.htm