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How to get the Case Number using ThreadID from Apex Class:
using ThreadID, we can get the relevant Case Number using “getCaseIdFromEmailThreadId” method. see the below example for your reference:
String emailThreadId = ’00DD0CG3j._500D0ZaQLq’;
// Call Apex method to retrieve case ID from email thread ID
ID caseId = Cases.getCaseIdFromEmailThreadId(emailThreadId);
system.debug(‘caseId:::’ + caseId);
Same way we can prepopulate the Case ThreadID using formula fields,
Here ThreadID is nothing but its a combination of Your Salesforce ORG ID and Case ID.