If you order your magnets and order the carrier cards do they automatically adjust the size of the mailing envelopes? It says on the envelope that comes with the magnet "If you are ordering a magnet with a carrier card, envelope will be 4.75"x 6.5" " But there is no option to add carrier cards when you are ordering the magnets. It just gives you an option to order extra envelopes. I don't want to order the carrier cards if they aren't going to fit in the envelope that the magnets come with.