Somebody else posted this, so I copied it for when my Ex arrived (sorry, I don't know who it was, but they deserve kudos!)
After reading some of the other posts, I decided to try to create a list of items to check to avoid picking up my Explorer in the excitement of the moment only to find issues or missing items a few days later. I combed over the forum to capture other owner’s experiences with picking up their Ex’s or common problems I should look for. Please feel free to add any additional issues or pieces of good advice.
General
Check VIN to match paperwork
No more than 100 miles on odometer
Exterior
Examine the entire exterior of vehicle for any scratches or dents. Check all lights, mirrors, windows, tires, paint, etc.
Signs of moisture inside Mirror Marker Lamp on lower front of side mirrors
Check to ensure Rear hatch is even and opens correctly
Removal of dealer emblem (if attached to vehicle)
Moisture or condensation in headlights or signals
Defroster lines all work on rear window
No pits, cracks, or marks on windshields or windows and all move as expected
Wheels are correct type and free of marks
Interior
Examine the interior for all features and ensure everything is in working order.
Cool/heated seats working and not loud noise
Seats should move in all directions
Tire Mobility Kit (under driver seat for Tow package) (Discontinued in 2012 model)
Check Sony Radio/CD/navigation system/etc. all tested
Check heat and air condition climate controls on all settings
Ambient lighting for Limited
Reverse camera
Electronic
Sync issues 2.8
Check My Key fob
Lock and unlock doors
Remote start
Test Drive
Check steering, transmission, ride, and braking
Adapt Cruise control/collision warning working
Listen for any A Pillar noises- (TSB 11-4-6 NOISE FROM FRONT BOLSTER AT HIGHWAY SPEEDS - BUILT ON OR BEFORE 2/4/2011)
Wipers work
Blind spot monitoring system works
Items from Dealer
Door keypad code
Owner manual
Sirius radio subscription information
Any accessory items
Roof rack cross bars
Floor mats
Cargo shade
Mud guards