Cheurupidaux gives you:
"Deliver 40 Shigeto bows to Lala Gohma in Northern San d'Oria. She can be found near Heaven's Tower." as an option for next Joiner's Shield quest.
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He says same thing for 40 Gendawas if choose to change item.
"Deliver 40 gendawas to Lala Gohma in Northern San d'Oria. She can be found near Heaven's Tower."

Heavens Tower is no where near in Northern San d'Oria.