Like you say many roads in that area, when we were last riding around there ChiangMai, ChiangRai, Nong Khai the roads were great.
The heavy use main roads are the ones to avoid.
Saw a wallet on the side of the road picked it up gave to the Mrs and her asking around a guy came to pick up his wallet from the house it had been stolen.
Just a small amount of money was taken and the cards left so probably kids.
I do the same if it were a case.
Well if OP doesn't bother doing anything changing the tr to F and added ed is what OP will be.
OP hasn't come back but my advice would be just ride it around locally but hire or buy something legal to tour Thailand.
Interesting i was born in England and my mother was half French, my father half Irish and my surname is the same as 2 previous Presendent's to the USA. ????
So, bike with invoices is a grey import no difference today apart from the fact years ago it was OK.
Today however bike confiscated and destroyed.
Brown envelope donation locally are still available depending where you live. ????
I don't see how they could do such a thing unless the bike was new you should get your money back from them or report them to Honda head office in Bangkok.
If it's a bike commonally known as a grey bike that was bought with only papers and has never had a green book is not really worth the effort.
Last time i enquired about my CB400SF in Bangkok 10 years ago or more it was going to cost approximately 51,000 baht that's if it passed an inspection and then there were going to be other costs involved.