I had a similar thing happen when I was away last weekend - the squirrels went nuts on a few of my pear trees. No Chojuro or Fondante des Moulins-Lille this year Some of them they hauled away but there were lots just lying on the ground untouched.
Its been a frustrating squirrel year here, it was going reasonably well at the start but has turned worse than usual. I just switched to wet cat food bait to see if that helps. What is frustrating this year is I am having long periods with no squirrels and then (just as I go out of town for the weekend, it seems) a mob shows up and strips a bunch of stuff. There are many birds eating the bait so I need to refresh daily. If the cat food is not liked by birds that will be a big plus. I am trapping a lot of birds, the tube traps are very sensitive.
For some reason the whole problem is in the rear orchard, the front orchard is pretty much squirrel-free. 8/10ths of the traps are in the back but its not helping.