The specifications given are correct to the extent information cm, unfortunately just not correct the term "for 1-3LPs". Everything else is fine: quality of cartons, delivery time, price, and customer service, who answered me within 2 days ago.
However, the response was more oriented to marketing and not to my question / statement that the boxes are actually unsuitable for the delivery of 3 LPs. The seller had withdrawn the boxes, so fair enough I just say customer service is professional.
I keep the boxes as I send often, a single LP, but unless I need shipping boxes for 3 LPs to buy this stop somewhere, with the right dimensions. + No problem Thanks anyway.