You need to make sure that the packaged bread which you buy has the CRELEM Logo and was baked by Crelem and was not baked locally on site!
to find the shops which do sell the CRELEM breads
https://www.crelembakeries.be./nl/verkooppunten/
Switzerland – Kosher List:
Please note following important points regarding Kosher bread:
Bread may only be bought in the original bags of Coop or Migros, i.e. without any printigs of “Hausbäckerei”, “frisch ausgebacken” or “ofenfrisch” ➢ In Coop-Pronto-Shops and Migrolino-Shops no bread may be bought. ➢ Bread Migros: The article must correspond exactly to the number on the kosher list – and may not contain additional figures (i.e. 002), because the bread was then produced in another bakery. In case the additional figures consists only zeros than it may be used.