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You haven't told us what is the model of the remote you are now using it so we can't know what are its stored set of controls and if the one for the new box are between them.
But there is another possibility: a so called learning remote - a remote that can learn the commands from an original remote. So if your present remote is a learning one - almost surely is, since there are no universal remotes designed with codes for door opening or thermostat changing - then all the persons helping you will have to do is to program the new remote's commands in it the way they programmed the other unusual commands, so no need for a preprogrammed set and its 3-digit entry code.