i don't mind..as long as they stick all their stickers on one
spot. 
if i really need to call, i will call the number which is on top of
the stack of stickers. so see which locksmith more hardworking and
always paste ontop of their competitors, i will probably patronise
it.
one qns though, is there some sort of procedure for them? like take
down your particulars before opening the door for you? cos they oso
don't know whether u are the real owner of the house wad.