Honestly I'm kinda tempted to fake pursuing the inheritance, cause sure, Lock, Stock, and Barl is just a funny joke, but the whole situation smells incredibly scammy already, the Empire being 1000% full of fraudulent titles and Nigerian Prince schemes and such, and might very well be somehow linked to the major murder ring set up here in the road.
How many other travelers might have received such a letter, before Tragically Lost in the forest?