For all the talk about Edgar being unwilling to kill the cats, a trip in a trunk to a faraway country would eventually have done just that. Even with sufficient air holes, the long time it would take to deliver it (this IS 1910 after all) would have guaranteed that Duchess and the kids would have slowly starved to death inside. And that's exactly what Edgar's fate is unless he has the common sense to make lots of noise while he's still being carried off to the distribution depot. I'll take the classic fall off a tall building, thank you.
Yes, this is because Edgar is really, incredibly stupid. He'll probably get out of the trunk at the post office when he starts making noise and will be too embarrassed/scared to return to Madam's house.
And not to worry, since this is a Disney film, the cats probably DO have nine lives.
Since cats really have no use for money other than food and water then the money inherited might as well have been Edgars because he would still have to take care of the cats after the Madame passed. So yea Edgar is VERY stupid.