I believe map is going to give you results in the same order as any other splunk search , latest to first, but you're unlikely to get a second hit with the same src , dest and sourcetype in that kind of time window, unless it's the same guy a third time, so you're getting the right result either way.
The funny thing is, about a week after I read and commented on your use case, I was requested to identify similar cleartext password entries in our system, and mask them. Nontrivial, I must say.
... View more