Follow Randomized blocks_survey already ran

Hi, I randomized two blocks (two possible scenarios for the respondents to read, no choices or questions on them). After been assigned to any of the two scenarios, each participant answered a questionnaire. All participants answered the same questionnaire. Thus, I am trying to detect which scenario saw/read each participant. I'm going crazy because I already ran the study, so I can't to re-do anything again... Any help would be awesome! Regards,