I sort of look at the logbook as being, well, a log book. Logging in and out TBs makes a paper trail that can sometimes help track down missing TBs. [snip] Perhaps I'm completely off the mark here, [snip]
I don't think you're completely off the mark. I think you should log anything of significance you did to the cache. I think most items added or removed are significant. Adding a pencil or pen for the log book probably is not significant, adding a special pencil or pen to a writing implements cache is significant.
In essence there are two logs, each a backup for the other. If someone forgets to log an action in one, hopefully they logged the action in the other. However, since the online log is more easily accessed by anyone, at anytime, and isn’t likely to be destroyed or lost; it’s probably best to at least log it in the online log.