XenServer VM snapshot restore script that worked for me.

VM-restore.sh

#!/bin/bash

#Direcotry of backup VMs
VMS_DIR="/mnt/20160711/"

########################
GUNZIP="/usr/bin/gunzip"
PRINTF="/usr/bin/printf"
XE="/opt/xensource/bin/xe"

#######################################################################

function restoreVMs {
        cd $VMS_DIR

        for vm in *.{xva,xva.gz}
        do
                uncompressVM "$vm"
                $PRINTF "Restoring $vm\n"
                $XE vm-import filename="$VMS_DIR$vm"
        done
}

#Pass vm name
#If name ends with xva.gz, decompress the file and change name (remove .gz)
function uncompressVM {
        if [[ $1 == *.xva.gz ]];
        then
                $PRINTF "Decompressing $1\n"
                $GUNZIP -d "$VMS_DIR$1"
                $PRINTF "Decompress complete.\n"
                vm=${vm:: -3}
        fi
}

restoreVMs