Ask the owner which version control board his FEC has. Chances are, it was a V46 from that time line...probably the most reliable and hassle free board CS used, though I'm unfamiliar with the new IQ5.
My 2nd FEC has been through 3 boards (covered by the exceptional warranty) and the last one Bill sent me was the V46, which he said they went back to due to it's reliability.
The V46 touch pads require no hair dryer fiddling in cold weather, hold a very consistent and accurate temp. My 1st FEC100 shipped with the V46 and I've had zero issues other than an internal fire of my own doing.
How much are they asking?