When you see a pattern emerging whereby the same seller sells into the bid with few thousand shares at the end of each day painting a lower close, to me this may be a positive indicator.
It's not a certainty of course, but rather a question of probability that the motive behind this action, especially on the eve of expected significant news, is one where the big boys/MMs want to control the SP movement. It can be to accumulate more shares prior to the news, which I think is not the case here, or to not let the SP run away on low volume prematurely. Unlike us retail investors, the big boys need liquidity/volume to take some profit if and when the SP rises significantly post news.
Conversely, when they paint the SP higher at the end of the day without cause, I become very cautious as it may suggest a pump and dump motive.
The key differentiator is the news that is expected to be significant.