Just contacted Level 2 support, and he gave me an email address to send a list of the missing episodes, and in the process I found more shows unavailable on the X1 boxes.
Missing from X1 master and mini boxes on top of the episodes from my last post
K-ON! Season 2 Subbed episodes 1, 2, 3 and 13
K-ON! season 1 Subbed episode 10 (Training Camp Again) (Is available under Season 2 episode 16 Underclassmen, which may be overwritten when S2 C2 is uploaded)
Notes
Hopefully, with the email I sent, the discrepancies between boxes may get fixed. Kinda doubt it though😥
Comcast Xfinity Intercession City FL 33848
Thanks 