Only when the customer explicitly asks to undo a removal. Pass exact removalIds from remove_leads or list_leads removal.id. Restores the same lead in its original sequence with its progress; paused sequences stay paused. No copy is created and this call sends nothing. Replies, opt-outs, changed sequences, overlapping outreach and unconfirmed sends can block restoration; explain each returned reason. Retrying the same removal IDs is safe and cannot undo a later removal. Company exclusions and cancelled imports are not reversed. Open world: restored outreach may later contact these people through the ordinary paced engine.