Which body verifies packaging against the PPWR?

None. The PPWR does not provide for verification by a third party. The manufacturer as defined by the regulation assesses conformity itself, documents it technically and issues an EU declaration of conformity. Whoever places packaging on the market under their own name or brand is that manufacturer, even when they do not produce it.

What exists instead

For individual requirements of the regulation there are tested proofs, and those come from accredited bodies. Recycled content under DIN EN 15343 and ISO 22095, recyclability with performance grades, PFAS-free status, plastic content. Such proof does not replace the declaration of conformity, it supports it: the technical documentation then rests on tested data instead of self-declarations from the supply chain.

How to recognise robust evidence

It rests on a published certification scheme, conformity is assessed by a body accredited to ISO/IEC 17065, the analysis runs through laboratories accredited to ISO/IEC 17025, and the individual certificate can be looked up by number. Providers calling themselves “PPWR certifiers” usually offer consulting or software, not the testing of a material property. Which four proofs flustix supplies is set out on the PPWR page.