A local boy Golf in Lak Si in 2013 about 80 Baht. I kept a stack of 10 Baht coins on my wardrobe, because washing machine requires 3x10 Baht coins. That boy and some of his friends were in my room, and I saw that he saw, and he saw that I saw that he saw, the money on the wardrobe. I thought it’s too high for him to reach, and I would keep an eye on it anyway. But suddenly the money was gone. Then I could see the shape of the coins in his pocket, but couldn’t come up with an occasion to hug him and get my hand into his pocket to get the money back before they left. The same group of boys stole my Swiss army knife (estimate 2000 Baht) another time we met. You could argue that 80 Baht is not worth writing about, but he would have stolen 100, 1000, or 10,000 Baht if he had had the opportunity.
Headache boy 1500 Baht
A friend Bank (no sex) stole about 5000 Baht in Sakon Nakon on Fri 17.07.2015. Reported here: http://christianpfc.blogspot.com/2015/07/sakon-nakhon-various-impressions.html Originally I thought it was the driver who stole the money. But on my last trip (autumn 2016) to Sakon Nakon I learnt from the abbot that Bank is now in prison, he stole and/or embezzled money from the abbot as well!
A friend Art (moneyboy) tried to steal my camera on Mon 16.11.2015. Details here: http://christianpfc.blogspot.com/2015/11/christianpfc-catches-thief-in-his-room.html That would have been a financial damage of 22 kTHB. He tried to steal several underwear as well, actually he brought a back pack so he can get all the stolen goods out of my room. Before he stole about 2000 Baht (no proof, just the feeling "yesterday I had more money in my wallet, where has it gone?" without drawing a connection to the boy), and on that day stole 200 Baht (I counted before and after his visit).
A friend Bom (moneyboy) stole 300 Baht (I counted) on Tue 12.07.2016. http://christianpfc.blogspot.com/2016/09/gay-activities-july-2016_21.html But he is cute and good in bed, will invite him again, once I have figured out how to secretly record video of my room to get the next theft on video (just for my own pleasure, I have no plan to confront him). 1100 for ST and 300 stolen.
Update Mon 26jun2017:
Bom Minburi 1000 for ST and 820 stolen, recorded on video.
Boss McDo was in my room on 20jan2017, and on 26jan2017 I notice my bluetooth headphones (cost about 1600 Baht) and my only long-sleeved shirt (cost estimated 200 Bath) are missing. This boy has a track record of "borrowing" underwear and shirts whenever he came to my room, and not returning them. I have no proof, but everything fits. Only alternative is that I had headphones and shirt with me on the trip, and hotel staff stole it.
A friend Ball steals about 6000 Baht (5x1000 Baht note and about 10x100 Baht note). Our relationship started very positive and up to the theft there were good prospects: http://christianpfc.blogspot.com/2017/03/dating-thai-boys-49-boy-on-bus.html, whereas Golf/Art/Bom were stupid and lazy, not useful for anymore than a fuck.
Interesting: Art and Bom took so little that I wouldn't have noticed if I hadn't counted. Bank and Ball took so much that I must notice, but they didn't take all of it.
"If you expect the world to be fair with you because you are fair, you're fooling yourself. That's like expecting a lion not to eat you because you don't eat lion."
Other avoidable losses:
In my early years (2009-2012), I twice lent money to Germans who I just met (500 Baht in each case), even exchanging phone number or email to facilitate return of the money (I was that naive at that time!). I just couldn't imagine that someone can fall that low to borrow money (500 Baht, at that time that was 10 Euro!) from a compatriot without intention or means to return it.
Shortchanged in Bali 2015 (about 30 Euro loss), attempted shortchange in Bangkok 2016 (would have been 3000 Baht loss).
Forgot bag in taxi 2015, despite instantly calling their hotline and describing everything in Thai, not returned. Here we don't know what happened. The bag was in back seat, the taxi might have been from a corporation, so driver did not notice when he returned it. Or other passenger found it and kept it?
One attempted robbery in Saranrom in 2013 (boy drunk or drugs?), one attempted robbery in Lak Si near my place in 2013 (drunk), one attempted robbery near Hua Lampong http://christianpfc.blogspot.com/2015/11/christianpfc-almost-gets-robbed-at-hua.html, one attempted theft in a songtheo in front of Seacon Square Srinakarin http://christianpfc.blogspot.com/2015/12/seacon-war-of-steel-battle-of-thailand.html.
The interesting connection between the last two is that the robber/thief tried to look into my wallet while I was paying something. As I'm taller than most Thais, they have to get on their toe-tips or make a long neck, and I noticed subconsciously in both cases, but didn't draw conclusion.
Sidenote: I should pay more attention to my subconsciousness. In some cases I noticed subconsciously that something is wrong, but didn't raise that to my consciousness.
Language note: I define the following:
A thief uses stealth. The victim doesn't notice until after the theft. In perfect cases, the victim doesn't notice at all (Had I not put 11x100 Baht notes in my wallet before Bom came to my place, and had I not counted 8x100 Baht notes left after he left, I would not have noticed that 3x100 Baht notes are missing!). There is only one person involved in a theft, the thief, whereas the victim is away or unaware of what's going on.
A robber uses violence or force. Either threatening the victim or chain or bag snatch. There are two people involved in a robbery, the robber and the victim.
In German we have this clear and useful distinction (theft = Diebstahl, robbery = Raub), which seems to be missing in common English (consulting dictionary and asking friends). However, https://en.wikipedia.org/wiki/Robbery supports my definitions. If you know better, please comment.