I am from Texas, so I meant I replaced the Shenmue 1 case with new ones, and I was assuming you would do the same as it appeared you are also from North America going by what you are getting them for. But you can still get clear replacement cases online with no games needing to be cannibalized.
But what is done is done. It is up to you what you do mate. Just letting you know in case you wanted to sell them off again as complete games. I know Walmart used to have clear replacement jewel cases.
Edit: Holy crap, I feel like an idiot. In all honesty though, the resolution of the games is pretty low so was hard to even see that they were PAL cases in the first place, even when opening original image and zooming in. I now see why you said something about PAL cases in your post, I thought you assumed I was in PAL land and I was wrongly assuming you were in NTSC land.