Not much point in digging up words which have nothing to do with bully. One could go on digressing till the sky falls.
billet- started life as a word for a branch, in Medieval Latin, or tree trunk; applied to a thick piece of firewood in the 14th c. (in a work printed in Latin in England). Now applied to chunks of metal, etc. And no, has nothing to do with a ticket, a message, a fish, a list, etc., but is related to billot, which I would like to have a lot of (of which I ...).