Hi,
You need to have at least one attribute common in your 2000 contacts to filter them using Advanced Find.
Here is a simple work around. Export all your 2000 contacts into an excel sheet. We will come back to these records in a minute. Add an attribute temporarily as a flag to your contact entity. Lets call it 'ContactUpdatedForAF'. It can be of a type nvarchar.
Now, go back to your excel sheet and add a column 'ContactUpdatedForAF' in it. Let's put value 'Yes' in this column for all the rows. Re-import this file and update 2000 contacts.
Now, you can find all these 2000 contacts using Advanced Find. You just simply have to look for all those contacts that have 'ContactUpdatedForAF' = 'Yes'. Select all those contacts and add them to your marketing list. Once you have added them to marketing
list, go back to your customization and remove the temp field 'ContactUpdatedForAF'.
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Thanks,
Imran Abbasi