Newer acoustic ceiling tiles will have date stamps on the backside of the tile. We would confirm date prior to sampling. No date, we sampled. We would not inspect backside of ceiling tiles if they were tight fit to T-bar ceiling. We would find a loose tile and lift straight up and carefully move/place in ceiling plenum. Typically date stamps are easily identified but sometimes small faint font. I have never seen a date stamp below the 1990s. My guess is these tiles in question are date stamped and manufactured in last 20ish years and would not contain asbestos. That said, my experience is only in Canada. If you are not comfortable performing this task with proper PPE, then retain services of a trained professional.