A looping script could loop through such a list and find your records: Scripted Find Examples
But you can also define a relationship matching the field into which you paste your 100 ID numbers to the ID field in your table and this can be used to list these records in a portal or pull them up in a found set. (And the Isempty() function can be used in a script step to determine if any such related records exist.)
Table1::IDList = Table2::IDField
Table1 and Table2 can be two Tutorial: What are Table Occurrences?--making this a "self join" relationship.
IsEmpty ( Table2::IDField )
If evaluated from the context of Table1 will return true only if no ID numbers in IDList match to any records in Table 2.