The only component that qualifies as "used" is the IFAK pouch & cover, however, most of them are in excellent/like-new condition as well. See photos for details and examples of complete USGI IFAK units.
USGI IFAK II Complete Medical Field Gear Kit Individual First Aid Trauma
USGI US Army MOLLE II Individual First Aid Kit IFAK Pouch - Multicam – Offbase Supply Co.
USGI IFAK Individual First Aid Kit Medical Field Gear Complete Pack
ARMY OCP SCORPION IMPROVED SOLDIERS FIRST AID KIT IFAK II w/ MEDICAL SUPPLIES - Centex Tactical Gear
USGI Multicam IFAK Pouch With Insert
Individual First-Aid Kits WW2 US Medical Research Centre
USGI IFAK Individual First Aid Kit Medical Field Gear Complete Pack
The only component that qualifies as used is the IFAK pouch & cover, however, most of them are in excellent/like-new condition as well. See photos
USGI IFAK II Military Individual First Aid Kit Medical Field Gear Complete Pack
NEW USGI IFAK II Military Individual First Aid Kit Medical Field Gea - LockNWalkHarness
IFAK Individual First Aid Kit Pouch
USGI IFAK Individual First Aid Kit Medical Field Gear Complete Pack
USGI IFAK II Military Individual First Aid Kit Medical Field Gear Complete Pack