How do you know which such certainty that they weren't used as decorations of some sort?
Precisely because the people postulating it do not think of anything but dumb untechnological peoples who are not as modern as ‘us’. Those who used gold for decorations ( see any civilization from Egypt through the Celts etc) did so with inlays, chunks, leafing, etc.
These tightly wound spirals show purpose and precision....plus they were not on ANYTHING decorative. Instead they were in a box with an animal pelt