That appears to be why the hospital originally thought they’d been removed; but the Post article cited above in its current form appears to me to say that two days later the employee admitted having left the vaccine out on purpose.
Initiating an internal review on Monday, hospital officials said they were initially “led to believe” the incident was caused by “inadvertent human error." The vials were removed Friday and most were discarded Saturday, with only a few still safe to administer at Aurora Medical Center in Grafton, Wis., according to an earlier statement from the health system. Each vial has enough for 10 vaccinations but can sit at room temperature for only 12 hours.
Two days later, the employee acknowledged having “intentionally removed the vaccine from refrigeration,” the system, Aurora Health Care, said in a statement late Wednesday.
Because the information’s given in that form (I quoted that portion without internal deletions), I read it as saying that ‘intentionally removed’ means ‘intended to leave the vaccine unrefrigrated’, while the earlier assumption of ‘inadvertent human error’ would cover ‘took it out to get at something else and forgot to put it back’.