For me it went like this.
While I was a member at the time the first question came through, I did not have the reputation required to see it in the queue. I read the question and determined for myself that "I've had questions about sending postcards home while on travel" so that question fit (loosely) the topicality question, and so I did not flag it as off-topic. I also did not up or down vote it at the time.
Now your question comes along. I have the reputation, and so saw it in the close vote queue. I read the question and paid attention from a topicality viewpoint. I could not see the connection to travel in your question. While what you were asking help with could have been a question a (temporary) traveler might have, it is one that (more likely) a (permanent, or ex-pat) resident would have. I simply did not see the relevance to a visiting traveler. Hence my strong consideration to Vote to Close.
Lastly, basing an argument that an (off-topic) question be allowed to remain because some older (also off-topic) question was allowed, does not make good policy. The older off-topic question should potentially be re-visited, and not just allow the newer one to remain. This is essentially analogous to "yes officer you caught me speeding today, but you missed my brother yesterday so you should let me off today because...". The rules are the rules, although the 'rules of topicality' are not quite as cut and dried as something like speeding laws.