> mkdir some_dir
> find /foo/bar/ -name '*.csv' -print0 | xargs -0 mv {} some_dir

mv: target `/foo/bar/XX.csv` is not a directory

mv /foo/barXX.csv some_dir

find /foo/bar/ -name '*.csv' -print0 | xargs -0 mv {} -t some_dir

mv: cannot stat `{}': No such file or directory

> touch file1.txt
> touch file2.txt
> mkdir my_dir
> mv  file1.txt  file2.txt  my_dir

$ find /foot/bar/ -name '*.csv' -print0 | xargs -0 mv -t some_dir

-t, --target-directory=DIRECTORY
          move all SOURCE arguments into DIRECTORY

$ mv 1.csv 2.csv 3.csv ... -t some_dir

$ find /foot/bar/ -name '*.csv' -exec mv -t some_dir {} +

ls /foot/bar/*.csv | xargs  mv -t some_dir