Hello Proxy!
I've listed all 6 Missing Mini Cargo Trucks on Sixth Street for you to get some easy rewards and complete the Keen Senses Medal from Officer Mewmew 
You can find the first Cargo Truck on the balcony next to the Video Store 
First Missing Mini Cargo Truck on the Balcony next to the Video Store
The Second Cargo Truck is in the alley directly opposite of the Remodelling Shop, where you upgrade your Bangboos
Second Missing Cargo Truck in the Alley opposite of the Remodelling Shop
The third Cargo Truck is standing on the left Side in the Street after Howl's Newsstand 
Third Missing Cargo Truck in the Alley after the Newsstand
You'll find the fourth Cargo Truck if you follow the Street between the Noodle Shop and Coff Cafe all the way back on the left side next to some Containers
Fourth Missing Cargo Truck in the Alley between the Noodle Shop and Coff Cafe
The fifth Cargo Truck is in the alley on the right of the Arcade, opposite to Coff Cafe 
Fifth Missing Cargo Truck in the Alley opposite of Coff Cafe & next to the Arcade
You can find the sixth and last Cargo Truck at the entrance of the Metro right after Box Galaxy 
Sixth Missing Cargo Truck in front of the Metro Station after Box Galaxy
Don't forget to claim the Keen Senses Medal from Officer Mewmew for rewards
Officer Mewmew Keen Senses Medal
Here's a list of all Rewards you'll obtain
Infographic about all Rewards obtainable from the Cargo Trucks on Sixth Street
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