Both games are in good condition. Assassin's Creed comes with the Dickens and Darwin Conspiracy pack and Arkham Knight comes with the Harley Quinn DLC. Each party covers their own shipping. I'll trade for Xbox games or Xbox Live points.
Anything really, my collection isn't that big. Some of the newer games like Need for Speed Payback and Battlefront II look good, but I'll consider any offer. I also have a month of EA Access to pad out my side of the deal and some 360 games like the Force Unleashed, Minecraft, and Modern Warfare 2.
imo it would be a tough trade to get something really new like NFS or BF2. The games you listed are older and more then likely most people have already played them and won't want to trade a new game for several older ones. It could happen, but your best bet would be to just outright sell them and then buy what u want, if its something really new