Check the corners and edges for whitening, look across the surface under angled light for print lines and scratches, and inspect the holo for indentations
The argument that I think is most relevant to Modern, the format where I think its most likely that playing more than 60 will be right first, is a variation on this argument that focuses on fetchlands specifically
First Edition Base Set means that the booster box in question is part of the Pokemon TCG's first print run - subsequent printings lose their First Edition label
The set of the evolutions would create a beautiful collection on their own, which suggests that all nine of the Pokmon, when Eevee is included, will likely become high-priced pieces
Big credits to him for an amazing work providing these high quality blanks
(1) Add 1 Armored Xyz card from your Deck or GY to your hand, then you can make the Levels of up to 2 face-up monsters you control become 3 or 5 until the end of this turn