Cavern of Souls, Roaming Throne, Adaptive Automaton, and Banner of Kinship are some prevalent examples
If sending just one or two cards, consider taping the card-holding top-loader(s) between two more empty top-loaders, for extra rigidity and peace of mind (ensure tape is applied at the sides, so there is no way for the card(s) to come in contact with the tape)
Booster boxes go for $7,500-$10,000 and Gold Star Torchic is one of the most desirable cards in the entire lineup, especially if its in perfect condition. 18
Lucario LV
Now all they need to do is include some filing organizers the way Pokemon does in their ETBs and well be set
Unless Chord of Calling shows up a lot in Standard, this cards future is the $4-$5 range