Hi Todd.
I'm an American living in Chiang Mai.
Just before Songkran, I checked the SCB branch in Mae Jo and they were willing to let me rent a large size box. I passed and ended up getting a small box at Krung Thai bank on Mahidol Road just down the street from Airport Plaza. The do require a 30k baht deposit.
Do you have a work permit? If not, that might've been the problem with SCB.
Regarding risk, I'm more worried about counterfeit ingots than any government shenanigans or floods.
Good luck
jpop
Searching for SDB's in Thailand
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