The certification document that accompanies a sealed reliquary is often times referred to as the authentics. On the top of the document is the name and position (and sometimes but not always a coat of arms) of the Roman Catholic ecclesiastic official who has authenticated the relic(s). This could be the Postulator General of the religious order, the Vicar General of the Roman Curia, a local Archbishop / Bishop or their vicars.
The body of copy that is usually written in Latin with the variation of the following text:
To all and each who will inspect our [document] we make a sure pact and attest, just as we have for many presented sacred relics, that we recognize them as picked out from authentic places, with legitimate documentation, and confirmed by seal; from these [relics] we have removed a [description of the relic], which in reverence we have placed in a silver theca, oval in shape, guarded by a single pane of glass [and] bound on the back by a cord of true silk, red in color, secured by the impression of our seal in red Spanish wax. We have given said Holy Relic as a gift with the permission to keep it among yourselves, to give it on to others, and to exhibit publicly in whatever church, oratory, or chapel for the adoration of the Faithful, and for the greater glory of God, Greatest and Best, and the veneration and worship of His Saints.
The document is a public acclamation as to the authenticity of the relic, of which a high-ranking ecclesiastic official has signed his name. Typed or hand-written into the blank areas is the name of the saint and abbreviation of the cause of their sainthood, as well as any distinction of honor that the Catholic Church might have placed on them posthumously. There is also a description of the relic itself, and a description of a theca or a reliquary that it is housed in. On the bottom of the authentic is the date of issuance, the seal of the office, and the signature of the authenticator.
On the back of the theca, there is a seal of red Spanish wax. The relic itself is held in place in the theca by threads that cross over it. The threads are fed through the walls of the theca on opposing sides and it is sealed shut with a wax seal bearing the imprint with an insignia of issuing religious authority. This seal and the threads should under no circumstances be broken because they protect the integrity and validity of the authentication.