Help me find Book #13

I'd like to ask the help of anyone out there to find my sketchbook #13 and I'm going to post this out to a few different places but I'm going to try and get it back again to make my collection whole again.

About 2 years ago I left one of my sketch books #13 on a seat at Flinders Street Station and it sailed off into the unknown. And while I don't have much of an idea of the contents I do remember that the back of the book has a hand drawn poker chip with the number 13 on it (for luck of course).

Rough impression of what it looks like.

The sketchbook itself is about half full (as far as I remember) and is, as all the others, an A5 sized visual diary with a black plastic cover. As far as I can remember it, it was a 100 sheet(they market them as 200 pages) book and all the sketches in it will have been created in pen, as per my other sketches.

I know it could already be in a landfill in a Werribee Refuse centre but I am hoping for luck to be on my side.

Reward

So the big thing that I'm throwing out there is a reward of $100(Australian) and a personal sketch for the person who brings it to me, or multiple sketches if there happens to be more than one person helping.

If you are holding out for a bigger reward I can possibly offer some stationary from desk drawer but other than that I'm pretty much out.

I don't know whether this will help but I really would like to have all 27 books back in my hands.
Also If you can send this around, I'd appreciate it too. 

If you have any questions please post below. I'll answer them as succinctly as possibly.

p.s. I do apologise to all international and interstate viewers. Though if you do find it somewhere I will still give you the reward. (and may have to write a story based on it)