The relics business is way more organized than I thought. There are technically three classes of relics, first (actual remnant of a saint), second (remnant of object belonging to saint) or third (touched a first class relic or a saint’s tomb) [1]. So technically it’s always possible to manufacture more relics.

[1] https://m.ncregister.com/blog/smcafee/i-made-a-third-class-r...