Well, this code transfers all items from the recycle bin to your inventory (player 1)
I'll make an all-players version too
Code:
@[[Convert to Thumb]]
add r2,pc,#1
bx r2
.thumb

ldr r1,inventoryslot
ldr r2,recyclerslot
mov r3,#0x1C

transfer:
ldrh r4,[r2,r3]
strh r4,[r1,r3]
sub r3,#2
bpl transfer
bx lr

.arm
inventoryslot:
.long 0x21D88FE
recyclerslot:
.long 0x21ECCAE