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If it works on the bash command line, and not in a bash script, is the script really being bash interpreted, not sh? It must be chmod to executable as well as having the right path to bash on the...

#!/bin/bash
# tested on bash 4
shopt -s globstar
shopt -s nullglob
numfiles=0
for files in **/*.xls
do
cp -p "$files" /destination
((numfiles++))
done
echo $numfiles

Bash and some systems ksh can do this:
find . -type f -iname '*.xls*' | tee >(
cpio -dumpv /destination_path
) | wc -l | read cnt