@jonty I see a press release on this by the Hong Kong Monetary Authority:
https://www.hkma.gov.hk/eng/news-and-media/press-releases/2023/10/20231020-4/
"It has recently come to the attention of the Hong Kong Monetary Authority (HKMA) that shredded banknote paperweights sold at the HKMA Information Centre contain pebbles to make them heavier and enhance their function as paperweights. Therefore, the number of shredded banknotes inside each paperweight falls short of the approximate number stated on the paperweight label."
@Necrofancy @jonty There has to be more to this story. I demand the third episode! Maybe with invoices for pebbles bought by the Hong Kong Monetary Authority.