There was another set like yours here:
https://www.shpock.com/en-gb/i/XPp96...boac-cufflinks
And I found these, which are packed in a similar box but feature a different design:
https://www.worthpoint.com/worthoped...nks-1533893861
Either giveaways or sold to customers, could be both. Not that many about.... but that's based on a five minute Google search so I could be wrong.