There are many different ways of changing documents or making misleading documents. With the current technology it is possible to change even pdf files without it being visible.
Look in any case for the wording ‘EU type examination certificate’ (or exact same wording in another EU language – check the national version the legislation for the correct legal term).
Names such as ‘verification of compliance’, ‘certificate’, ‘certification report’, … are not the correct legal term and thus documents with such titles are not valid EU type examination certificates.
Also look for the name and number of the Notified Body (number is 4 digits). To be sure the Notified Body is indeed genuine and notified/competent for PPE, you can check on the Nando database (https://ec.europa.eu/growth/tools-databases/nando/index.cfm - on the site it is possible to search by number, by name of the notified body, by country, by legislation 2016/425 for PPE).
If the address of the mentioned “Notified Body” is outside the EU, this is already a strong indication of a problem with the document as Notified Bodies for PPE are all based in EU member states or in a few countries with a mutual recognition agreement such as Norway, Switzerland or Turkey.
If you have any doubts, do not hesitate to contact the organisation of PPE suppliers in your country, the market surveillance authorities in your country and/or the organisation issuing the document mentioned on the document to check the validity of the document.
Remark that some of the issuing organisations offer the possibility to check the validity of their documents on a website. However, a valid document in their view is not necessarily a valid EU Type Examination Certificate.