In the file /event-tickets/src/Tribe/Attendees_Table.php on line 805 there is a filter of tribe_tickets_search_attendees_by which allows adding additional searchable fields for attendees. If you can add one more additional filter for the $items then we would be able to search by any custom meta data that applies to that attendee.

Here is an example:

New Filter that would go on line 806 (or before the other filter, doesn't really matter)

$items = apply_filters( 'tribe_tickets_search_attendees', $items, $search );


Then in my functions.php I have:
```
/**
* Add ticket ID as searchable
*/
addfilter('tribeticketssearchattendeesby', function ($searchkeys) {
$searchkeys[] = 'ticketid';
$searchkeys[] = 'wattendeefirstname';
$searchkeys[] = 'wattendeelastname';

return $search_keys;

}, 999, 1);

/**
* Add contact info to items array
*/
addfilter('tribeticketssearchattendees', function ($items) {
foreach ($items as &$item) {
// check if the item contains the "contacts" attendee meta key
if (($item['attendeemeta']['contacts'] ?? false)) {
// make sure the value is a valid id
$id = (abs(filtervar($item['attendeemeta']['contacts']['value'], FILTERVALIDATEINT)));
if ($id > 0) {
// load the contact
$contact = new \WTBA\Model\Contact(getuser_by('id', $item['attendee_meta']['contacts']['value']));

            // add the new data items to the existing item so they can be searched upon
            if ($contact) {
                $item['w_attendee_first_name'] = $contact->user->first_name;
                $item['w_attendee_last_name'] = $contact->user->last_name;
            }
        }
    }
}

return $items;

}, 999, 1);

This can provide pretty powerful functionality with next to no dev time.