Alex, I hope you are able to go back and scout out around that spot again. I'm sorry I wasn't aware your rocket had gone missing that day or else I would have helped with the search.
I'm a big believer in the Eggfinder as a tracking tool having used it to track rockets from a couple of miles in the air to miles downrange. The last 100 feet of the track can be tricky if you aren't aware of the error margin of a GPS fix. Given the way you tried to search all around the spot it sure sounds like you did it right. I'm pretty sure when you do get back out there, you'll find it. I'll also try to let the landowner know to be on the lookout for it in the meantime.
Now I have had an occasion where my Eggfinder got ejected from a payload area on one of my rockets. It fell from a couple of thousand feet and survived. So in that case I ended up in the scenario of looking for a rocket and finding just the Eggfinder alone in the field. I tend to stow my Eggfinder with foam around it, so that may have helped it survive the fall, but the point is it can. Sorry I won't be out there for a few weeks, but good luck with the search!