Was going about creating my glyphs like usual and made several duplicates of a letter when later I realized they all disappeared (C.001, C.002, C.003). Looked for them in the bottom search bar and held the undo keys until it no longer could and pressed redo in case I thought I missed the disappearance. I exited the program without saving hoping to see if I can retrieve the way I opened it but they are all gone. I’m really sad I can’t find them anymore.
This sounds like you either had a sidebar selection, e.g. a List filter, and/or a search term in the search field at the bottom.
Pretty sure the duplicates were there and it was the quitting without saving that really deleted them.