I believe this should work, but please test on a backup directory.
shopt -s extglob; mv 8953-*/!(\!*) /mnt/FOLDER
This turns on pattern matching and then moves all files in those folders which do not start with exclamation to the destination folder.
If the files all are named .jpg
when ready, it is easier:
mv 8953-*/*.jpg /mnt/FOLDER