yeah he is kind of stupid to do it that way, its to easy to spot and he gets punished for doing it pretty soon.
he actually have a reason to why he thought he could( and might have ) gotten away with it, but it was busted by Yuna simply because she made the lord realise it too fast.
but it's something that is mentioned as a side note in the novel like 200 chapters down the line AFTER his head rolls.
( the novel seems to be have been written arc by arc with whatever the author thought was cool and is kind of a mess if you read the author notes...just like my spoilers

).
long story short, he have family that is connected to the royal family ( who actually isn't asswipes unlike a lot of other nobles who will feel the bear´s wrath later on )
and if he had gotten the money out off town and quit his job before he was found out he would have gotten away with it "because politics".
its a stupid plan, but it was A plan..... so he was not quite as stupid as he first appeared. he was betting his life, fortune and family honor on the fact the lord was to busy to deal with it in time.
*incert scooby doo reference about meddling kids here *
