All the mushrooms in the study have the same growth pattern. I would document how open the cap was and if the veil was still in tact / partially in tact. There is a goldilocks period for picking mushrooms. But more importantly I'd make the huge investment in glass sample jars and desiccants. Especially if my last even worse written study went on and on about mushroom stability yet actually only showed that mushroom samples are wildly unstable when not kept fully dessicated because of botching sample handling in that study as well.