I made some deep boxes from reclaimed lumber and it looks like one of my box joint fingers popped out due to a flaw in the wood (old elevator crates) Now my girls have a new "top entrance" they are using and guarding LOL. Its on the second deep in a double deep setup so while not true top entrance it provides them a shortcut to the second brood box and they are definitely using it.....I cant find the little piece of wood anywhere inside though...checked the boxes last week when I was inside inspecting and its not in there so wondering if the girls "pushed it out" when they realized it was loose?
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I am using rough cut lumber from my home made saw mill. If I ever get bees going, they may find all kind of entrances. My logs have not been many that are defect free. It is still all fun.
Cheers
gww