I’ve had this debate before. Mostly with myself, but once with another person, on whether Box Bottoms count as part of a set.
To me it’s clear they although they do not count as part of the base set they definitely count when doing a master set.
I remember the 85-86 OPC box bottoms. It was Super Mario’s RC and you could get a neat variation on the bottom of of a box. It was the first box of cards I ever bought and I made sure to get the box with Mario on it.
For the 2012-13 OPC Set their are 2 versions of the box bottoms.
The Blaster Box bottoms consist of 2 cards and come in 3 options. They use the base card format for the cards.
The other options are Sidney Crosby & Jonathan Toews, or Alex Ovechkin & Ryan Nugent-Hopkins
The Hobby/Retail Box consists of 4 cards and comes in 4 options. They use the Retro look for these cards.
1 Sidney Crosby, Pavel Datsyuk, John Tavares, Tim Thomas
2 Alex Ovechkin, Phil Kessel, Henrik Lundqvist, Gabriel Landeskog
3 Steven Stamkos, Ryan Nugent-Hopkins, Claude Giroux, Carey Price
4 Jonathan Toews, Martin Brodeur, Evgeni Malkin, Eric Staal
Datsyuk is another personal fav, and the fact he is paired with Crosby made this the one to get first..although the Brodeur panel looks good as well.
Thats 2 items (or 6 cards) off The White Whale. If you can help with the other 3000 + cards missing please let me know.