There was one post before about how I transported my models from the US to Hungary and then the UK (and then back to Hungary).
Here’s the second option: Christmas ornament boxes. I bought this in Florida, but I’m sure there are similar ones available online. It has three trays, and they can be adjusted to fit the models you want to protect. Some of the dividers can be cut to shape, so that they hold the models down when slotted in place. Throw in some packing peanuts and you are golden- all safe and protected.
(The box has been sitting in the attic for years, and only now had I had the time to get it. As soon as I have a little more time I will unpack the models, and feature them on the blog.)