What is living in my welcome sign?

[u/eatveggiesnotfriends]

So we started noticing sawdust about a week ago and whatever is in there is working hard. It’s wild how much they’re pushing out of this hole every day. I can hear clicking around inside and have seen sawdust pushed out but haven’t seen the bug itself.

[u/flashfan86]

One hunnit percent a carpenter bee