Thanks Darren. I'm not worried now. I know how to respond if I get questioned in the future, and I'll make sure I have my 3 "proof of's" on hand. Cheers.
Thank you Stan. You're certainly a "Frequent Flyer". I agree, I think he was being over-zealous. He just came on duty, and I was the first in line. I'll try to pick out a lazy one next time. Then again, he might have suspected I am working or have a business in Thailand.
Thanks Graham. Sounds like I'm ok at the moment with the 3 proofs. I've been visiting Thailand since 2004 and this was the first time I was questioned about it. I know they don't like more than 2 land border entries per year, but I only arrive by air.