Flat slabs should be placed vertically in a container instead of piling one atop another, in order to minimize risk of breakage. If not, try to obtain this information from other collectors or books on the site. Fossils are of little scientific value without site data. Until individual fossils identified and labeled, store the site information with the fossils themselves. As your collection grows, it will be increasingly difficult to keep track of your fossil finds and the sites from which they came unless you have good written records.
Human memories are very fallible and tend to fade with time.