Step 1:
Unpack your Bus Pirate V3(BPV3), you get one Bus Pirate and a block of foam which used to protect BPV3 during the shipping.
Step 2:
Fix BPV3 on chassis, double sided tape is a nice option.
Step 3:
Reuse the packing foam, cut it into suitable size and place it to the positon as below.
Step 4:
Final step, cover the case.