You're correct that picture wasn't accurate as it doesn't contain enough weapons. Here you are:
https://www.thesun.co.uk/news/3092362/shocking-police-pictures-reveal-10000-weapon-arsenal-intended-for-the-hands-of-terrorists-including-howitzers-machine-guns-and-grenades/ (https://archive.is/n2fSn)
https://www.express.co.uk/news/world/684623/Islamist-extremists-hide-huge-stockpile-of-weapons-near-German-mosque (https://archive.is/f5nBX)
https://www.thetimes.co.uk/article/weapons-cache-seized-during-raid-on-mosque-7jvdttrm0x0 (https://archive.is/ianPl)
https://www.thenewamerican.com/world-news/item/22526-france-to-shut-down-100-to-160-mosques-war-grade-weapons-found-in-some (https://archive.is/LKw8i)
(post is archived)