To be honest, I agree that it should not be very sensitive either but sending the signal to everyone, even if only fraction of them actually have way to pick up the info, feels a bit off. Ultimately it is up to them if they feel its supposed to be only for authorized people or not.
Most of the staff probably has smartphones by now but I’m sure they have those as well that do not which is why I’m a bit hesitant to do that. I know they are not allowed to use phones during work (obviously) so they might even leave it at locker even if they got them so that might impose a challenge as well.
I am very excited for this chance though and hope to contribute towards Ruuvitag during this as well.