I really enjoyed filling up my Half Jasmer grid. It took me quite a while but I completed it last summer. I'll attach a screenshot.
I'd been quite organised and had made a bookmark list of a few "possibles" for each of my missing months, then gradually worked through them. Looking back at it now I've noticed that quite a number of the months have their caches archived. And its not the oldest ones either. It seems that everybody looks after the really old caches, but not those from 2004 and 2005. So I can see this challenge getting much more difficult in the future.
This one took us about ten minutes to find. I'd been leaving this one for Bobcat to do but as he hadn't found anything I joined in. After a while I decided to read through the cache page again. I spotted an attribute and that led me off to somewhere we hadn't been searching. And lo! there was the cache.
We swapped the Frog TB for a Tall Ships badge. I got a text from my daughter just as we were signing the log. She was ready to be picked up - so that's the end of the caching. Perfect timing in fact.