I believe this is somewhat covered under the post here https://discord.com/channels/874145774135558164/1294375783456047125
but there are slight differences, such as that card actually being on the premises, for clarification I wanted to make a new post.
Can a player register a full 80 card decklist without, for example, 4 of those cards on them at the start of the tournament, expecting them to be delivered later in the day?
From what I've been able to find it's a Card-Pool Contents Error, missing cards and a caution, one of the main downsides presumably being that they are functionally playing with a smaller card pool. The clause of "they may find replacements in their own time" meaning they can add them to the physical deck later on in the day. It all makes sense, as it covers cards being lost or destroyed throughout the day, and allowing players to replace them.
It's just a bit of a strange loophole and I wanted to double check. There are several events this weekend where I know players had intended to play a certain deck, but due to distribution issues the product has not yet arrived.