Landed in Hot Water

During a deck check in round 4 of a PPTQ, you quickly spread out the player’s deck, face down.You notice that five of the cards seem to be in sleeves that are a millimeter or two smaller than the rest. Those 5 cards are a Botanical Sanctum, an Island, an Aether Hub, a Spirebluff Canal and a Servant of the Conduit. You ask the player about his sleeving process, and he says that he sorted the deck, filled out his deck list, then shuffled his deck a bit, then sleeved. He also mentions that he had to use two packs, because the first pack didn’t have quite enough sleeves for his entire deck. You’ve ruled out any type of Cheating. What do you do?

Issue the player a Game Loss for Marked Cards. The five cards which are discernable from the rest are all blue lands or are able to produce blue mana within a turn. Knowledge of this could enable a player to gain substantial advantage, so the penalty is upgraded to a Game Loss.

Judges feel free to answer here!