This so-called international law is often repeated online, with no evidence that random consumer maps have ever been used to resolve a dispute. If official gov

This so-called international law is often repeated online, with no evidence that random consumer maps have ever been used to resolve a dispute. If official government maps shows a certain boundary it is evidence that the government at some point in time accepted that as fact (or pretended to accept it as fact). Consumer maps are probably meaningless unless the government or local officials were using them and they had no official maps to contradict the unofficial consumer maps. I vaguely recall some embarrassment in India where officials were using unsanctioned maps (but I can't find a link). As far as I can tell consumer maps (not used by officials) have never been used in an international court to prove a boundary. They can be, at worst, propaganda. There is not, as far as I can tell, any UN or other international treaty which mandate that any rabdom map is evidence of boundaries. In the Shebaa farms dispute, for example, Israel and UN officials cited official Lebanese military maps as evidence [0]. tldr; It is enough for China to police official government maps and the use of maps by officials, without confiscating maps tourists bring in ... unless it's all about propaganda to support spurious claims, which of course it is. [0] https://en.wikipedia.org/wiki/Shebaa_farms https://en.wikipedia.org/wiki/Shebaa_farms