I actually don't have the card yet (all I know about it is from the FAQ), though I assume it's like the Pizza Box, but for storing drunk fans instead of pizza. Since drunk fans wake up in 12 hours if not stored, it should be good to have some Risky Whiskeys to store the fans for later, for when you need to go on a mission but don't have the required number of fans.

According to the FAQ, the item is "infinite use" like the Pizza Box. When you use the stored fans in it, it'll be emptied and can be used to store fans again.