The caches are open to all and you can find one or all five. Each of the four territory caches (GC15VXK, GC15VXT, GC15VYF) has part of the coordinates to the final (GC15WHG) cache taped on the inside of their lids.
There are only two rules to log your find...
1.You must find all five caches in a 23-hour period.
2.The above rule only applies to Scoobert.
Oh and thanks to Scoobert for agreeing to this little test of El Dorado County caching.