The original pill bottle container, placed in 2003, is difficult to access and requires some real skill and determination. Geocachers in the past have been able to reach this container with some effort, so it is definitely possible.
For detailed directions on one method of removing this cache, CLICK HERE (contains spoilers)
If you are not willing or able to do the work required to access the pill bottle container or find the magnetic lock-box, there is a muggle-proof way to log this cache. The point of this cache was always to bring people to Carhenge so they can experience the wonder that it has to offer. The most permanent and most fitting logbook for this site is the giant AUTO-GRAPH car on the northern side of Carhenge. Signing this car qualifies as a find.
It seems the pill bottle may have inadvertently been knocked deeper into the area that it is hidden, meaning that it cannot be seen and will require a fair amount of effort and luck to recover. There is another container hidden in the same location that has been found recently. It is a small, black, magnetic spare-key lock box (placed in 2008) that is attached to the underside of the vehicle. Since it is a small container and there is plenty of metal to attach it to, it can be very difficult to pinpoint. This is good in that it probably wont be muggled, but it is bad in that people may not want to crawl around in the dirt to try to find it.
It is not permitted to sign the car where the pill bottle and lock-box containers are hidden. The folks that manage Carhenge have had problems with people writing graffiti on all of the cars. Technically, there is only one car at Carhenge that is meant to be signed - it stands vertically and says "AUTO-GRAPH". Signing any other car is against the Carhenge site rules.
NOTE: The difficulty is referring to the hidden containers. Signing the AUTOGRAPH car shouldn't be very difficult, unless you forget to bring a sharpie!
Cache is located at the famous Carhenge, just outside of Alliance, Nebraska. Carhenge was originally constructed in 1983, but is constantly being added to. It is built as a replica of the actual Stonehenge in Great Britain. Enjoy this site, and remember to bring the camera for this amazing spiritual junkyard.
Admin Note: cache was hidden without knowledge of the ban on "vacation caches". This cache is currently being maintained with help from Kevin Howard of the Alliance Visitors Bureau.