Fortbyte Challenge 72 has the hint “Found within SALTY SPRINGS”. The fortyte can be found in the middle of salty springs inside the red car. Simply destroy it to pick up fortbyte 72.
Fortbyte #6 | Yay! Emote at an ice cream shop in the desert (Season 9 Fortnite)
Fortbyte #7 | Use CUDDLE UP Emoticon inside a Rocky Umbrella Location (Season 9 Fortnite)
Fortbyte #8 | Found within Junk Junction (Fortnite Season 9 Fortbyte Locations)