American Heirloom Collection Missing Pages??

A few months back I purchased a complete set of Mystic American Heritage Collection albums. I am combining four different collections into this one and am now at the revenue series BOB stage. Very surprised to find that the AHC pages stop at Scott R150 and start up again at RW1. Could someone please let me know if they have a similar gap or does Mystic have a packaging /shipping error on my albums. I love the albums otherwise.

Just a followup on this. Mystic does not publish pages beyond R150.
Their response is - "A complete Revenue album would be several albums in size on its own, and would not be able to be contained in something the size of our supplement, unfortunately. I am sorry for any disappointment or inconvenience." I guess I understand their reasoning but would think that they would at least offer the complete series as an optional purchase. Guess I will have to print my own from Steiner. It looks like about 350 total pages available in Steiner. Would really like to keep this set of albums consistent with same pages though.