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Booty Booster Packs are Items that can be bought in the Pirate Shop for 1799 Gold. After purchasing the item, it will send 4 Pirates to your Gift Box, picked from lineups that differ per Booty Booster Version. It will always send at least one Bling Pirate from the respective Booty Booster Version as advertised in the Shop.
As of Booty Booster Pack V2, you were able to get two Bling Pirates, but you were still guaranteed at least one.
As of Booty Booster Pack V3, all Bling Pirates have their names changed to include "Bling" in front of it. You were also able to get up to four Bling Pirates and were always guaranteed at least one.
As of Booty Booster Pack V4, the item sells for 1499 Gold, but you only get 2 Pirates, both of which will be Bling Pirates. One of them will be from the respective Booty Booster Version as advertised in the Shop, while the other one can be ANY Bling Pirate from all previous Versions.
While these items are technically not Rescues, you only receive Pirates, so they can be viewed as such.