Maybe everyone knows this or it's been written in this thread, but Topps definitely distributed in series (one through five) and an all-in-one series. OPC is all-in-one series only. I do not know where the all series boxes were released. They are relatively uncommon in my experience.
Note how the OPC box says "team checklist in every pack." If this carried over to the Topps version, it could explain the source of the blue checklists.
I am attaching photos of my second series box (labeled as such), my fourth series box (black "hey kids") tab, and empty all-series box (pink "hey kids" tab and note the all series designation on the box side). I know first series had a tab that said "1st Series" because I lost out on an auction for one. Still sad about that.
I am also attaching an empty OPC box and OPC pack. The Topps version of this pack is very similar looking, but I don't own one.
