It's not a problem that Project-GC can solve; the information available to us from geocaching.com is insufficient. To be more specific, each cache log has a date and log ID which is a number. This tells us which log belongs on what date and in which order they come on that day. That was all fine and well until labs appeared. For labs, we get a timestamp. This also tells us which date the lab was logged on, but then it tells us the exact time. Obviously we can also sort lab finds in the proper order, but since we don't have a time for regular caches we can't tell in which way the sequence of regular cache finds and the sequence of lab cache finds should be intertwined.