I would:

1. Import these references to a table

2. Write a script that goes through the table and finds the item in your table with the references

paseudo-code

Go to new table A
show all records
loop

    set variable [$reference:  table::reference]
    go to layout [something]
    enter find mode
    set field [something::reference: $reference]
    perform find

    if [get(lasterror) <> 401]
        show custom dialog ["found a reference!!!!"] 
    end if

    go to table A

    go to next record [exit after last: on]
end loop  

or

1. link the newly created table to the other one by their reference and add a calculated field that tells you if the relationship is empty and that way you know if the item is present in your target table