"Mail volumes increase by three times in the run-up to Christmas and the thing about mail is that it's not something you can stockpile, " Mr Hayes added.
Just before Christmas, the Royal Mail replaced it with an Elizabeth II box which means it is unaffected while the keys have been lost for the older models, said Mr Bach.
In 1951, IKEA founder Ingvar Kamprad branched out beyond the basic business of mail-order Christmas tree decorations, ballpoint pens and bird seeds and added a catalog-only furniture business.