We found it, yay!
This morning we went for a nice 3.5 mile walk with Caz at a local reservoir which has a Nature Reserve all the way around it. We said hello to the ducks (we like ducks, remember) and other birds we saw, but had a bit of trouble looking out of the window in the twitchers’ hide, as we were too small to see over the ledge!
Never mind, we did find a cleverly-hidden little geocache nearby, smaller than me! So we helped sign the log and let Caz put it back on the hook so we didn’t drop it in the water.