foundc=0
nfoundc=0

for file in $FILELIST
do
   if [[ -s "${file}" ]];then
       # file is found and is > 0 bytes.
       foundc=$(( found + 1 ))
       ...do something else you want...
   else
       # file is not found or is 0 bytes
       nfoundc=$(( nfounc + 1 ))
       ...do something else you want...
   fi
done

print "number of files in [$FILELIST] found = [${foundc}]\n"
print "number of files in [$FILELIST] NOT found = [${nfoundc}]\n"