Five Relics Are Banned From Shops

The Courier, Old Coin, Lucky Fysh, Bowler Hat, and Amethyst Aubergine are hardcoded into the merchant blacklist, so they can never appear in shops.

Five relics override IsAllowedInShops => false and never appear in the merchant pool: The Courier, Old Coin, Lucky Fysh, Bowler Hat, and Amethyst Aubergine. Major Update #1 (v0.103.2) added the last three after gold-generating relics broke shop economy testing — they remain craftable through other sources but are walled off from the merchant.