Do yourself a favor and cough up more money and buy a brand new set and get extended warranty just in case. It's still very affordable for S60's. I don't know how you could of missed it at the store before you purchased it, if it was a display model.
Media room- LG 4K OLED EG9600, Pioneer Elite VSX-90, Samsung 4K K8500, Klipsch Gallery G28's, Klipsch Sub 12, Klipsch RS-52 II, Optik HD cable
Living room- Sony 4K 79XBRX900B, Onkyo RC-360,HTPC, Klipsch Reference R-62II, Rc52II,PS4
Gaming room -Panasonic ST60, PS3, Wii