I know Matchbox cases aren't as well tracked as Hot Wheels, but it would be helpful to be able to add case letters when we know what cases the cars come in. I find with Hot Wheels it is especially helpful since it makes it easier to filter what I might be hunting for when I come across a specific case. Currently this isn't an option with Matchbox.

There might need to be an international case letter and a US case letter though which could be defaulted by a setting of country in profile. For example Mattel dropped the E case in the US and combined them with what was supposed to be the F case. I don't know if internationally there was also a different E case.