To be honest it seems like something that would be really easy to make, Not that i know richard about scripting* for oblivion/whatever the engine's called
OnUnequip + SetPCBounty would do it.
(I don't know any OBSE commands so there might be something better)
*Most i've done is texture editing in oblivion and map + npc editing in Fallout 3, I don't think i've ever opened a script file.