Acorns Instead of Eggs?

acorn_nest

Hey birders and biologists! Has anyone ever seen this phenomenon before? What appears to be bird eggs at first glance in this photo are actually acorns. The owner of the nest hasn’t been identified and I haven’t been able to find any literature about this kind of behavior (except for the use of artificial eggs to control egg-laying in pet birds). Does anyone know what’s going on here?

Some potentially helpful info:

Location: Southern New Hampshire, Merrimack Valley area

Size of nest: approx. 5in/10cm in diameter

The nest is about 4 ft/1.2m off of the ground in a climbing bush, sheltered by the side of a house.

Please comment if you know anything about this little mystery!

EDIT: My guess is that a mouse did this- check out this post for something similar!

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