Currently, during the CNCOA address update process, BB's import set-up switches the information between the existing and incoming address. The new address is assigned the date added information of the address it is replacing. The record ID and 'added by' data is also switched. The previous address is assigned the 'date added', record ID and 'added by' information at the time of the update. So, it is correctly marked previous, yet appears to have been added the date of the update.

This is directly from BB support.

I find this confusing. I am fairly certain the RE user community is unaware this is happening. I am new to the industry, but this seems like a big deal.