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Chances are, it isn’t. The early Catholic Church did a lot of this kind of thing, where they would claim to have a piece of the cross, or a bone of St Peter in a church. It was just to drive tourism into their churches. If you took all the claimed pieces of the cross and assembled them, it would make far more than one cross.
Not only early, they did such things in medieval times too.
Argh, what was it again. I’ve read about something the catholic church used in switzerland in 14. or 15. century for this.