Sean “Diddy” Combs was served legal papers related to one of his accuser’s rape lawsuits just days before Homeland Security agents bombarded two of his properties, RadarOnline.com can exclusively reveal. Documents obtained by this outlet reveal that a process server walked up to the embattled music mogul’s $40 million Beverly Hills mansion and handed the legal documents related to Liza Gardner’s lawsuit to a man who wouldn’t give up his name on March 19. The process server claimed that at 1:50 PM that same day, they “served a true copy of a SUMMONS, FIRST AMENDED COMPLAINT, ATTORNEY VERIFICATI…