In order for a survey to be considered valid, you have to have a certain minimum number of responses, so I'm not too concerned about what you think is probably a low response. I'm content they got enough responses to make the survey valid. Unless you want to dig up the actual survey and present it here?

You said they can't seize laptops because of the "5th amendment," which only states that private property will not be taken for public use without compensation. I'm not even sure that applies here, depending on what use they had for any laptops that didn't get returned to their owners (and some of them do not get returned to their owners). In any case, I presented you with several articles that say they are taking laptops for search and for seizure, just like you asked. That your mind has been changed or not, or whether I put any "new information on the table" for you, is of little concern to me. You asked for proof. I gave it to you. Whether you like the examples I gave or not is your concern.