I wasn’t asked for any proof of residence. I just filled in the address of the gym when asked for ‘address in Thailand’ (the gym does offer bungalows for rent), but they never asked for any confirmation or other proof.
Immigration can look up your TM.30 in their system, no need to show anything. The 90-day report can be done 1 week before or after the actual 90 day mark, so if
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is exactly 90 days since you came in and you’re leaving the 2nd, then no need to do it