The traditional practice is to have two candles lit when a first class relic is exposed for public veneration in a private Chapel or Oratory. When not exposed for public veneration they are either veiled or removed to a safe place, (never a tabernacle or aumbry). Any first or second class relic which is exposed in a public place of worship must have the authentication (documents). Not reuired for private chapels or oratories, most authrities do encorage that those who have permission from their local ordinary to keep first class relics in private homes follow the same protocol and not simply expose the relics when not engaged in acts of veneration…
There are several forged relics with documents stating that they were authenticated by Nicolas Ferrante. Fr. Ferrante was a Redemptorist who worked on the cause for the canonization of St. John Neumann of Philadelphia. Someone copied the documents, replacing then Blessed John’s name with the names of other Saints, including the Apostles, and other hard to obtain relics. They for some time were distributed by a convent in Rome, and a traditionalist priest in Arizona, who it would seem were unaware that the relics and paperwork were not authentic. So we need to be careful about these relics.