Museum Collection
4 Mini boxes - 5 cards per mini box
One On-Card Auto, One Auto'd Relic, One Quad Relic, and One Jumbo Relic per master box
I received the following:
Base Card

12 unique base cards - or 12% of the 100 card base set
Museum Collection issue is a premium issue and is in reasonably high demand. One hobby store sold out quickly with boxes going in excess of $200 per master box - definitely not for the faint of heart. Museum Collection is printed on thick stock with a glossy front and reverse. The front has gold foil and the reverse has personal stats along with career MLB stats. There is also a short write up called Career Appraisal.
The base set contains current players, retired players and historical players -- such as Babe Ruth. I will make the assumption that there is a rookie or 2 in the set, however, I did not receive one in this master box.
I would like to see in a premium set such as Museum Collection a base set of 150 - 125 of current players both vets and rookies along with 25 retired/historical players - Ruth, Mantle, Cobb, Ozzie, Ryan, etc.... maybe it's just me...
Parallels
Copper

Kyle Schwarber and Greg Maddux
Sapphire / Amethyst

Sapphire - Trea Turner #ed to 150
Amethyst - Jose Bautista #ed to 99
Primary Pieces Quad Relic

Giancarlo Stanton #ed to 99
All four pieces are black....
Archival Auto On Card

Al Kaline #ed to 99
Meaningful Material - Ruby

Corey Kluber #ed to 50
Momentous Material Jumbo Auto Relic

Dustin Pedroia #ed to 15
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Museum Collection is an issue that is excellent for the player collector - not so much for the set builder and a major hill to climb for the master set builder. For those chasing singular players, there are base, sapphire, emerald, copper, amethyst, gold parallels along with triple autos, laundry tags, 4 player primary piece cards, and this list can go on for quite a bit... i.e. something for nearly everyone and every pocket book.
The 2 patch piece cards that I received are pretty cool and the 3 cards with the jersey pieces are extremely thick.
Overall grade B+ a bit pricey and the number of base cards is slim...
Go buy several master boxes and send the Rays parallels - if there are any Rays.... to me.
Duane