[Eaglerock562]

This can be found on the nba website under their in-season tournament faq:

Each of the 22 teams that do not advance to the Quarterfinals of the In-Season Tournament will be assigned two regular-season games (one home game and one away game) that will be played on Wednesday, Dec. 6 and Friday, Dec. 8. A formulaic approach will determine the matchups for these 22 games using the Group Play standings in each conference (fifth through 15th).

Two of the 22 games will be scheduled cross-conference because there will be an odd number of teams in each conference that do not advance to the Quarterfinals. These cross-conference games will be scheduled between bottom-finishing teams in Group Play subject to travel constraints, and no team will play more than one of its two games cross-conference. The other 20 games will be scheduled within conference featuring teams that are otherwise scheduled to play each other three times over the course of the season wherever possible.

The losing teams in the Quarterfinals in each conference will play each other in a regular-season game on Dec. 8.

So 2 east and 2 west teams would play each other according to the explanation above. First year doing this I don't expect it to be accurate in the game of course, but going forward maybe they could add the logic into the cpu?