Shami may be traded any number of Beastmen's Seals at any time and he will store them prior to use, keeping your inventory clear of them. Shami will also return Beastmen's Seals up to 99 at a time for use in Fields of Valor elite training regimes.
Shemo may be traded 3 of one type of seal or crest for 1 of another seal or crest (3:1 trade). This can greatly assist a player acquire seals and crests for BCNMs and Limit Break quests.
Many new players to the game drop their Beastmen's Seals unaware of their full potential, thinking they just take up space. These players then regret the fact that they did this once they learn about the benefits one can get from these items.