the place of origin of something
provenance - source
The source of something or the place that it originally comes from is its ‘provenance'. This formal word is most commonly used in a professional context, especially in relation to the sale of goods and commodities where provenance often needs to be proved through official documentation.
The provenance of the artefact will need to be established before an accurate valuation can be made.
The leaked report is of unknown provenance, which makes it difficult to gauge its veracity.
In the end, those paintings turned out to not be authentic. The buyer was duped by a fake letter of provenance.