I believe I listened to that game on the rad. I'm sitting here imagining that I'm certain I did. I know if it was being broadcast and I wasn't incapacitated, I listen to it. Cant prove it though!
There used to be frequent expansion drafts. The many months leading up to one were stressful for existing teams. GMs wanted badly to shed players they expected to lose, but all other GMs were trying the same, so few such trades actually happened. https://www.basketball-reference.com/draft/NBA_1970_expansion.html
More info for those who didn't live through it. In that 1970 draft, 33 players were drafted from a 14-team league. 9 teams gave up 2 players, and 5 teams gave 3. From memory, in some expansion drafts, each team could hold 7 players (whom each team named in advance), so a team might lose its 8th, 9th, and 10th-best players. In other years, I think they could reserve only 6. That can really hurt. In the very last couple, I seem to remember they could hold 8. This lack of quality caused each new team to hurry to trade many draftees before the season began.