Give InventoryDrop

Hi,
I want to have people drop a notecard into a box and then the notecard is given to me in my inventory, here's what i have so far:

default
{
    state_entry()
    {
       llAllowInventoryDrop(TRUE);
    }

    touch_start(integer total_number)
    {
        
        llGiveInventory(llDetectedKey(0), "Notecard Name Here");
    }
    
    changed(integer change)
    {
        if ( CHANGED_ALLOWED_DROP == TRUE )
        {
            llGiveInventory(llGetOwner(), "" + (string) change + "");
        }
    }
}
 

However it doesn't work, any suggestions?