i worked in bangkok for 3 years, but that was probably before your wife divorced you and you came to Thailand to inject steroids and study muay thai. Tell me, do your kids call her new husband "daddy" now?
if you're certain that this tiny 6 satang spread is available, why don't you post where it is? Who is giving it? All I see is some half-assed graphic that tells me nothing, from someone who loves arguing on Facebook. Could be anything. What is headquarter?
Keep them in a safe. I'm assuming you're in Thailand for a long stay, otherwise you would just take them back on the plane yourself. Why bother trying to send them back? Keep them in Thailand. Hard currency can only be bought at a premium in Thailand. If you travel to a neighboring country, you'll want to be exchanging dollars, not thai baht. It's always a smart idea to have a stack of benjamins stashed away in case of emergencies.