Why do no records appear when I change pagingtoken date to a later date?
Not sure if it's something I'm doing wrong (usually it is).
The call I'm making in PHP is this:
$ch = curl_init("https://273-EQL-130.mktorest.com/rest/v1/activities.json?activityTypeIds=1&leadIds=1166102&nextPageToken=" . $pagingToken . "&access_token=" . $accessToken);
Let's take it as read that the access token is working.
I'm getting the paging token like this:
$ch = curl_init("https://273-EQL-130.mktorest.com/rest/v1/activities/pagingtoken.json?sinceDatetime=2016-11-01&access_token=" . $accessToken);
When I use November 1st as the sinceDateTime value, it works great: I get back 300 records (the max).

When I use October 1st as the sinceDateTime value, I get a similar result (300 records).
$ch = curl_init("https://273-EQL-130.mktorest.com/rest/v1/activities/pagingtoken.json?sinceDatetime=2016-10-01&access_token=" . $accessToken);
But when I use September 1st as the sinceDateTime value, I get no records returned, but "moreResult" is true:

This page says
The first is a paging token which represents a date. These are used to retrieve activities, data value changes, and deleted leads which occurred after the date represented by the paging token.
Should it not be the case that if I go to an earlier date, everything after that date would be subsumed under the description "which occurred after the date represented by the paging token"? And if that's true, should I not be getting results in my call with the September paging token, just like I do for October and November? Our Marketo installation was active as of July, so it's not that I'm going back before we had records...
Any help is much appreciated - thanks in advance!