Drop box in fire rated corridor wall

Since it is a corridor wall, the opening itself needs to be fire rated I'm looking for suggestions Most of the mail slots I find are more

There are Craftsman style mail slots in a variety of finishes like antique brass, oil rubbed bronze and polished brass The long brass slots come in finishes

mail slot for door Stainless Steel Door Mail Slot , Letter Box Plate Compatible With Any Door Type, 13 in W x 4 in H - -

mail slot for wall This Large Mail Slot with Interior Frame features a spring-loaded flap that opens outside, with an accompanying brass frame on the interior side