I thought it might be good to post a couple photos of a shed skin and what to look for to be sure the shed was complete.
An incomplete shed can cause eye infection(retained eye cap/s) and a retained tail shed can cause the loss of the affected tail section.
The first photo clearly shows that this snake did shed the two eye caps.
The second photo shows a complete tail shed. At first glance it may look like the tail tip didn't shed but it is there. It just didn't turn inside out.
This seems to happen to my adults more than my young snakes. If you are in doubt you can cut the shed to see if the tip is really there.
Most of the time you can see it though.