11:29 AM PT -- Investigators say they have videos of the men who paid for sex at the Asian massage parlor that Robert Kraft allegedly used ... and the footage is graphic.
According to police documents obtained by TMZ Sports, officials were able to get a covert surveillance camera inside the Orchids of Asia Day Spa in Jupiter, Florida to record illicit activity.
Cops list a variety of sex acts performed on 26 men who entered the business -- one of whom cops say is Robert Kraft. Kraft is not identified by name in the police documents.