Siegel's auction of June 22 just finished and most of the lots were reasonably realistic to the estimates, BUT........
$2.00 Conveyance, Part Perforated (R81b). Radiant color, perfect strike of "Illinois Central R.R., Land Dept., Jun. 18, 1863" circular datestamp, small tear at top left, Fine appearance, a difficult issue to obtain, the last we offered was in a 1996 sale, with 1996 P.F. certificate
SOLD for $10,500.00
The PF only has 5 on their website. I suspect Scott's price will change.