Thank you for writing.

The male is the wanderer.  The female is not. This is how to tell them apart. https://bestbeebrothers.com/blogs/blog/male-vs-female-carpenter-bees#:~:text=The%20key%20difference%20is%20the,in%20their%20tunnel%20and%20die

Chase the male to the nest. https://sciencing.com/carpenter-bee-nest-5583265.html

Carpenter bees do not make hives. 

Common Eastern Bumble Bee https://www.insectidentification.org/insect-description.php?identification=Common-Eastern-Bumble-Bee

The two can be distinguished. https://beehivehero.com/bumble-bee-vs-carpenter-bee/  
Finding 3 in 3 days is a bit odd.

Anyway, you have some clues on finding the home.

Keep in mind that the carpenter bee is an important pollinator that does not sting.  Pollinators are critically important to gardens, the urban landscape and for food. They are disappearing. https://extension.psu.edu/the-eastern-carpenter-bee-beneficial-pollinator-or-unwelcome-houseguest#:~:text=Carpenter%20bees%20are%20important%20pollinators,bees%20such%20as%20carpenter%20bees

That is nice to know. There are people whose first response is to reach for a spray can.

Best to you on finding the dwelling.