Blocked crop and missing hens

We have not entirely had a successful week with the hens. Though egg production is still going well, we have two missing hens. They disappeared on Monday afternoon. No clue, no sightings, no feathers. Nothing. I fear that they wandered off the allotment and onto a path and someone has decided to walk off with them. Meanwhile, today I have had to deal with a hen that has a blocked crop. I brought her back home and have had to massage her crop to break up the lump of food that she was unable to pass into her gut. This seems to have worked. We are keeping her in overnight but she has started eating again. If she is fully recovered in the morning, I will take her back to the allotment.