During the course of the Magnetism in Massive Stars (MiMeS) Large Programs from 2009-13 over 550 Galactic B- and O-type stars were observed using high resolution spectropolarimeters in order to characterize the population of hot magnetic stars. Recent careful examination of the large sample of "normal" (i.e. non-Be, non-supergiant) B-type stars observed in the survey has revealed two additional magnetic stars. HD 221218 is an apparently single late-B-type main sequence star hosting a very strong magnetic field (Bz~2 kG) with a rotation period of about 2.6 d. HD 155273 appears to be mid-B-type SB2, in which the broader-lined secondary hosts a field of strength Bz~0.2 kG. In this presentation we provide a brief description of the analysis and modelling of the data, and the results of our detailed characterization of these interesting systems.