It seems like there should have been 3 desks in the bottom right corner for Angela, Kevin, and Oscar, I’m pretty sure that was where the accountants sat.
and then the 2 desks to the left of them would be for where creed and Meredith sat.
and then Stanley and phyliss (and Andy later) in the upper right corner, with Dwight and Jim to their left, Pam at the front desk,
And then Kelly, ryan, and Toby in the annex.
Maybe those desks were vacant until they absorbed the Stamford branch and took on Karen and the others who eventually quit?