Seller seems to be good for the most part. They seem to be a non-business seller and based off of previous listings they tend to buy, hold, and resell. Looks like no one complained about missing cards yet.
Mind attaching more photos focused on the bottom of the cards and potential openings? any excess glue? does the air volume in the packages seem normal?
and yeah, like Fizz said, it might be worthwhile to ask on more forums. This community is really small, so my opinion might be one of the only ones you'll get here, and it may be incorrect since I only recently got back into TCG. I will try my hardest to continue investigating, though :)