i got the jungle key mold during (completely unnecessary as I would later find out) plantera preparation, and the crimson key mold during a bloodmoon while collecting Mechanical Worm parts
of course, some time after the crimson key, (yesterday) my computer explodes while I collect ectoplasm and dungeon loot during a bloodmoon and I lose my character... but lol game editing
rest in peace everything in my safe and piggy bank that I never seem to remember