If your respond about change/renewal passport in Kingdom. Maybe you're right.
First of all we don't know his nationality. That's why i've said MOSTLY because most of south asian country embassy here in Kingdom can't accept renewal/change passport without long-term visa and he said he entered without visa.
Also there's lack of information what reason he change to new passport. damaged? lost? expired?
let's said it's lost. So most of embassy will issue emergency/temporary passport that's mean the owner doesn't need to transfer any stamp on it
You can ask for emergency passport from high commission (embassy) then filling PC8 new passport application to replace emergency passport when arrived at home country, isn't ?
Emergency passport validty up to 12 months then you have no issue if you want to living here for another 5 weeks
Tourist visa, 2 bulan + 1 bulan perpanjangan. Correct
Kalo dapet kerja, convert dari Tourist Visa ke Non-B Visa sebenernya bisa di dalam Thailand TAPI biasa perusahaan2 sini minta nya buat di embassy tempat negara asal