As I said earlier, you cannot see them because they are hidden.
The only way to see them is to use the lsof command on the cas process. But depending on your environment, it might be tricky to run it. Here are some examples:
sessionPID=`ps -u ${userid} -o user:12,pid,ppid,stime,cmd | /usr/bin/grep cas | grep -v grep | awk '{print $2}'`
masterPID=`ps -u cas -o user:12,pid,ppid,stime,cmd | grep "cas join" | awk '{print $2}'`
echo
echo "*** Session CAS tables: files in CAS_DISK_CACHE ***"
echo
lsof -a +L1 -p ${sessionPID} | grep _${sessionPID}_
echo
echo "*** Global CAS tables created in this CAS session: files in CAS_DISK_CACHE ***"
echo
sudo -u cas lsof -a +L1 -p ${masterPID} | grep _${sessionPID}_
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