It's the second time I've turned up at the site to find there's only two days of collecting left, but I'm sure the last time I managed get at least a pair of critters of each trade-in - this time, it's more like "pick the six you like most, look at the pizza boxes from the time you've missed the event's trade-in altogether and be content with what you have".
Seems to me that, usually, most event pets were 2-3 tokens per pet (or, sometimes, two pets), while this event seems to favour 3-4 tokens per single creature. People who haven't missed most of the event, do you also have trouble picking up as many dinos as you wanted? Particularly fans of the Noah's Ark concept of "it'll be lonely by itself!"?