I have a partial update. The hoglets have been elusive, but a neighbour spotted one outside this afternoon. At only 208g it’s well short of a survivable weight, but unfortunately the local rescue centre is full and not accepting any more hogs at the moment.
The next closest option is a bit of a drive away, so for now the hoglet is safely tucked up with food, water and bedding before heading off in the morning. That gives us another night to see if we can rescue its sibling(s).