Uncompress archive, check contents, add missing files, recompress archive
Remove unecessary code
myDirList is assigned but never used, delete it:
myDirList = os.chdir('/home/pi/python/chap9OrganizingFiles/shutildir/')

You do not need to build a list as:
for dirList in os.listdir(os.getcwd()):
        myFL.append(dirList)
for listItem in myFL:

You can iterate over os.listdir(os.getcwd()) directly:
for listItem in os.listdir(os.getcwd()):