The final challenge of the Winterfest Mission will require you to search two ammo boxes at different notable locations: the Workshop, Shiver Inn, and Ice Throne. It's not a complicated challenge in itself, but you still need to know where to land to complete it! The notable places don't appear in full letter on the mini-map.
Map
Shiver Inn
The Shiver Inn is located south-east of Lazy lake. It's a huge igloo that contains a very large number of ice cubes. Inside, you'll easily find boxes of ammunition in the nooks and crannies.
The Workshop
Located on the edge of Weeping Woods, the Workshop is a former sawmill. Enter the central building of this large, notable place to find your ammunition boxes.
The Ice Throne
Fortnite developers love to incorporate huge items or furniture into the heart of the map. Here's the latest example: the Ice Throne is a siege-shaped building made entirely of... ice.
We recommend the Team Rumble mode to achieve this challenge, especially during the week following its release. It'll reduce your chances of running into warring enemies as soon as you land.