I guess everything is possible, but I counted the money in front of him and I asked him to count as well. I always do this when I deal with money. None of us noticed any fake note at that point in time. Half an hour later when we returned the note he has shown to me was different than the rest of the notes that was on the table.
I thought a long time before I wrote this post because I don't want to affect any good business on the island. This is our 12th time on the island so we are no novice.

Thanks,
Alex