Question about Really Useful Box Plastic boxes

Hello, Over the years, I've bought a large stock of Really Useful Boxes in all sizes. Except that it seems impossible to get spare handles in Switzerland. I found them on the US (https://www.reallyusefulproducts.co.uk/usa/html/onlineshop/rub/aBoxHandles.php#gsc.tab=0) and UK sites, but they only deliver to the US and UK. In Switzerland, the company responsible (https://www.reallyusefulproducts.co.uk/switzerland/) does not allow the purchase of handles and does not reply to the messages I have sent them. Have you found a way other than e-Bay, where sizes are generally not indicated and prices are prohibitive? Thank you in advance for your help. Sincerely Christian Voirol