You can complete archaeology collections multiple times for repeat rewards.
There is also a museum cart you can turn dupe artefacts into for a reduced chronotes without having to worry about collections.
Chronotes are great as they let u swap relics and can be sold for profit.
In the later end of the skill you also unlock ancient invention and artefacts dissassemble into 4 new component types that are useful for end game perks.
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SyAccursed's post in [Locked]What to do with multiple arch* finds that can be restored was marked as the answer