It is scraped from Pixit. They sell lost/found, evidence + seized item management systems. [1] The listings are public; it was cool OP turned this into a mini art piece.

[1] https://www.pixithq.com/

>Hundreds of places use one software tool for managing lost items, and I scraped their archives

Am I not understanding your question? It's one system - and either their archives are public on purpose, or their endpoints are simply unsecured.