Hey everyone, I don't want to scare people, but I heard a horror story yesterday.
My FH's coworker got married last year and their venue coordinator told him a week before their reception that maybe the would want to have some sort of security for the card box. Apparently it had happened at that venue the week before that some random person walked in - dressed in formal attire - and walked out with the card box while everyone was distracted with the reception going on. They found out from the guests afterward that there were upwards of $5K in the box (mostly cheques but some cash as well).
After that, my FH is going to designate one of his groomsmen to be in charge of our card box and lock it up once everyone is seated for dinner. Better safe than sorry I say.