Ten dollars anna shiny quarter!
But seriously, at the very least, some idea of general condition, estimated age, serial number range (you can sub in Xs in place of the last few digits)' and a bit more in general to go on.
I will also point out that unless you are watching the EE for a long period, what you will actually find there, unless it is very recently posted, is the stuff that did not sell. If it's priced well, typically it will be sold in a few days or less, if overpriced, or the seller is really not too motivated, it will be back to top several if not many, times.