Tetsu Kayama is indeed putting a lot of effort into making his cards unique, and we can spot them from a mile away (maybe not a MILE but you get it)
The most important note on sideboarding is dont side out Sphinxs Revelations
Graded Population Report: Onix [Reverse Holo] #61 Visualize the distrbution of grades in the chart
During the Refurbish and Inspection process original consoles may have minor internal or external parts replaced with brand new 3rd party parts including but not limited to lasers, switches, capacitors, thermal paste, pin connectors, buttons, batteries, etc
There are some other ways to get cards as well, although not as efficiently as opening a pack
In Fallout, we have the history of what happened in the Vaults which the player explores years after, to discover whatever experiments went on inside them