Finding Multiple Files at Once
I found the answer here: 

https://www.reddit.com/r/applehelp/comments/1qk525/how_do_you_search_for_multiple_items_all_at_once/

This worked for me:

Use the free software called EasyFind


Drag and drop your root folder in the window to set the source
Copy paste the list of photos you're looking for (you'll only see one in the box but they're all there if you arrow up/down.
Select "Any Word" in the options on the left
Hit enter to search
Select all the items in that list and copy (option+drag) or move them (drag) to a folder in finder.