I thought of that but the number of cardboxes is too huge for that, I think, and the guess room too small (and already used as a laundry). Could be a neighbour who asked to stock that for a short time...
As for a new permanent resident, I don't think RLC would break the dynamics between K&K, or make this apartment like B1 or B2 with an interrupted flow of girls, which would mean the departure of K&K.
Anyway, RLC should try to communicate much more.