Or can i take some full frames out of the old hive and put brand new ones in and that will hold them over until i can get some more boxes and frames?
Yes, you can. Once they are partially drawn (hopefuly only a couple of days), then drop that new box on top, pulling a frame of honey if you have one from the bottom and putting that up top, replacing the honeycomb with an empty frame.
Assuming that this is a new package (4/5th week?) it is most likely a supercedure cell of sorts. Sometimes the bees will just start raising a queen cell for no apparent reason, especially when the queen is new to the bees such as a package or a re-queening. In fact one of my mature hives would for no apparent reason start a single queen cell, and did this several times through swarm season and that made me nervous but they didn't swarm.