Not found in the inventory of shops.
https://www.stib-mivb.be/article.html?l=en&_guid=807d6ad4-0a8e-3410-ceb5-a7bd7e4d2d8a

There is Petit Paul in Montgomery but nothing reported in Merode.

Could you please provide a picture or a link to a document that could be helpful to confirm this.  There are only a few volunteers handling notes on their spare time and surveying every note is impossible.