Two of my father's cousins were killed on the Western Front in WWI. The boys had enlisted in Queensland, their home state.
Some years ago I found their deaths registered in Queensland with an AIF suffix. Today I re-checked my information and the registration number has changed. AIF has been removed and F inserted, but the actual numbers from the original are there with a slightly different arrangement. For example, one now reads 1922/F483 instead of the original 22/000843 AIF.
Have no idea of when (or why) it changed. Simplification?
Philippa