It might be simpler to import that list into a separate table and use a relationship to link values between the two tables. The Script step Go to Related Records, with Show only Related records and Match all values in found set, could be used to find all such records in your FileMaker table.
You could also paste your list into a global text field and let a script run down the list and produce the separate requests and perform the find for you. Do you know how to create FileMaker scripts?
I described such an approach last week in this thread: Using checkbox values to search on another text field using scripting.
I think I probably will just import the list to a separate table. That seems to work both quickly and easily. Thank you for your help.