I presume they have been included to pass the CE / FCC certification. They are shielding against electromagnetic some Section of the circuit including the power stage around the motherboard plus the I/O board (potentially power also) around the CM3 adaptation board. Nonetheless, BBB does not confirm the precision https://financefeeds.com/global-fx-market-summary-fed-and-boe-rate-cuts-fed-6-novemebr-trumps-re-election-golds-decline-8-november-2024/